├── .gitignore ├── 7-mongoose ├── src │ ├── validations │ │ └── course │ │ │ └── addCourse.js │ ├── middleware │ │ ├── adminGuard.js │ │ ├── errorHandler.js │ │ ├── validationErrorHandler.js │ │ └── authGuard.js │ ├── routes │ │ ├── user.js │ │ ├── index.js │ │ ├── course.js │ │ └── student.js │ ├── services │ │ └── course.js │ ├── utils │ │ ├── logger.js │ │ ├── jwt.js │ │ └── db.js │ ├── models │ │ ├── course.js │ │ ├── user.js │ │ └── student.js │ ├── index.js │ └── controllers │ │ ├── user.js │ │ ├── course.js │ │ └── student.js ├── bcrypt.js └── package.json ├── 5-api-server ├── index.js ├── src │ ├── routes │ │ ├── index.js │ │ └── task.js │ ├── middleware │ │ └── cors.js │ ├── utils │ │ ├── swagger.js │ │ └── logger.js │ ├── index.js │ └── controllers │ │ └── task.js ├── .vscode │ └── launch.json ├── package.json └── note.txt ├── es6 ├── hoisting.js ├── async.md ├── index.js ├── note.md └── es6.md ├── 1-node.js ├── messageB.js ├── messageA.js ├── home.html ├── other.html ├── server.js └── index.js ├── 8-docker ├── note.md ├── dockerfile ├── index.js ├── package.json └── package-lock.json ├── 4-23nodeassignment ├── package.json ├── index.js ├── router.js └── package-lock.json ├── 3-npm ├── package.json ├── quiz.js ├── index.js └── package-lock.json ├── 6-mongodb └── note.md ├── 2-restful └── note.md └── async ├── promis-quiz.md └── index.js /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules/ 2 | .env -------------------------------------------------------------------------------- /7-mongoose/src/validations/course/addCourse.js: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /5-api-server/index.js: -------------------------------------------------------------------------------- 1 | // const cors = require("cors"); 2 | 3 | // app.use(cors()); 4 | 5 | // router 6 | 7 | // GET '/tasks' 8 | -------------------------------------------------------------------------------- /es6/hoisting.js: -------------------------------------------------------------------------------- 1 | 'use strict' 2 | console.log(fruit); 3 | 4 | 5 | function sum(a = 1, b = 1) { 6 | return a + b; 7 | } 8 | sum(, 1); -------------------------------------------------------------------------------- /1-node.js/messageB.js: -------------------------------------------------------------------------------- 1 | const msg = 'another msg'; 2 | 3 | function getMsg() { 4 | return msg; 5 | } 6 | 7 | module.exports = { getMsg }; 8 | -------------------------------------------------------------------------------- /1-node.js/messageA.js: -------------------------------------------------------------------------------- 1 | const msg = 'secret msg'; 2 | console.log('1234'); 3 | function getMsg() { 4 | return msg; 5 | } 6 | 7 | module.exports = { getMsg }; 8 | // module.exports = getMsg; 9 | -------------------------------------------------------------------------------- /8-docker/note.md: -------------------------------------------------------------------------------- 1 | virtualization 2 | 3 | hypervisor 4 | 5 | container 6 | 7 | dockerfile 8 | 打包文件 9 | 10 | image 11 | 镜像 12 | 13 | docker hub 14 | 15 | container 16 | 17 | network 18 | -------------------------------------------------------------------------------- /8-docker/dockerfile: -------------------------------------------------------------------------------- 1 | FROM node:14 2 | 3 | WORKDIR /app 4 | 5 | COPY package.json package.json 6 | COPY package-lock.json package-lock.json 7 | COPY index.js index.js 8 | 9 | RUN npm i 10 | 11 | CMD [ "npm", "start" ] 12 | -------------------------------------------------------------------------------- /5-api-server/src/routes/index.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const taskRouter = require('./task'); 3 | 4 | const v1Router = express.Router(); 5 | 6 | v1Router.use('/tasks', taskRouter); 7 | 8 | module.exports = v1Router; 9 | -------------------------------------------------------------------------------- /8-docker/index.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | 3 | const app = express(); 4 | 5 | app.use((req, res) => { 6 | res.send('hello'); 7 | }); 8 | 9 | app.listen(3000, () => { 10 | console.log('listening on 3000'); 11 | }); 12 | -------------------------------------------------------------------------------- /5-api-server/src/middleware/cors.js: -------------------------------------------------------------------------------- 1 | module.exports = (req, res, next) => { 2 | res.setHeader('Access-Control-Allow-Origin', '*'); 3 | res.setHeader('Access-Control-Allow-Headers', 'content-type'); 4 | res.setHeader('Access-Control-Allow-Methods', '*'); 5 | next(); 6 | }; 7 | -------------------------------------------------------------------------------- /7-mongoose/src/middleware/adminGuard.js: -------------------------------------------------------------------------------- 1 | module.exports = (req, res, next) => { 2 | if (!req.user || !req.user.role) { 3 | return res.sendStatus(403); 4 | } 5 | 6 | if (req.user.role !== 'admin') { 7 | return res.sendStatus(403); 8 | } 9 | 10 | next(); 11 | }; 12 | -------------------------------------------------------------------------------- /7-mongoose/src/routes/user.js: -------------------------------------------------------------------------------- 1 | const { Router } = require('express'); 2 | const { register, login } = require('../controllers/user'); 3 | 4 | const userRouter = Router(); 5 | 6 | userRouter.post('', register); 7 | // POST /auth 8 | userRouter.post('/login', login); 9 | 10 | module.exports = userRouter; 11 | -------------------------------------------------------------------------------- /7-mongoose/src/middleware/errorHandler.js: -------------------------------------------------------------------------------- 1 | const logger = require('../utils/logger'); 2 | 3 | module.exports = (error, req, res, next) => { 4 | // if 5 | // if 6 | logger.error(error); 7 | return res 8 | .status(500) 9 | .json({ error: 'something unexpected happened, please try again later' }); 10 | }; 11 | -------------------------------------------------------------------------------- /8-docker/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "8-docker", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "node index.js" 8 | }, 9 | "keywords": [], 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "express": "^4.18.1" 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /4-23nodeassignment/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "4-23nodeassignment", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1" 8 | }, 9 | "keywords": [], 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "express": "^4.17.3" 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /7-mongoose/src/middleware/validationErrorHandler.js: -------------------------------------------------------------------------------- 1 | module.exports = (error, req, res, next) => { 2 | if (error.name === 'ValidationError') { 3 | return res.status(400).json(error); 4 | } 5 | next(error); 6 | }; 7 | 8 | // next(new Error('')) 9 | // next(new CustomError('')); 10 | // class CustomError extends Error { 11 | 12 | // } 13 | 14 | // if (error instanceof CustomError) { 15 | 16 | // } 17 | -------------------------------------------------------------------------------- /3-npm/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "3-npm", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "node index.js", 8 | "dev": "nodemon index.js" 9 | }, 10 | "keywords": [], 11 | "author": "", 12 | "license": "ISC", 13 | "dependencies": { 14 | "express": "^4.17.3" 15 | }, 16 | "devDependencies": { 17 | "nodemon": "^2.0.15" 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /5-api-server/src/utils/swagger.js: -------------------------------------------------------------------------------- 1 | const swaggerJsDoc = require('swagger-jsdoc'); 2 | 3 | module.exports = swaggerJsDoc({ 4 | definition: { 5 | openapi: '3.0.0', 6 | info: { 7 | title: 'JR tasks', 8 | version: '1.0.0', 9 | contact: { 10 | name: 'mason', 11 | email: 'exmaple.com', 12 | }, 13 | description: 'xxxxx', 14 | }, 15 | }, 16 | apis: ['src/controllers/*.js'], 17 | }); 18 | -------------------------------------------------------------------------------- /es6/async.md: -------------------------------------------------------------------------------- 1 | 异步 2 | asynchronous 3 | 同步 4 | synchronous 5 | 6 | console.log(1) 7 | setTimeout(()=>{ 8 | console.log(2) 9 | }) 10 | console.log(3) 11 | 12 | 同步 = 等待 = 阻塞 （BLOCK) 13 | 异步 = 不等待 = 非阻塞 （NON-BLOCKING) 14 | 15 | js 是一个单线程语言 16 | 17 | Input / Output 18 | I/O 19 | 20 | call stack 21 | stack overflow 22 | 23 | stack FILO 24 | queue FIFO 25 | 26 | CRUD 27 | create read update delete 28 | 增删改查 29 | 30 | CRUD Operation 31 | CRUD service/server 32 | -------------------------------------------------------------------------------- /7-mongoose/src/services/course.js: -------------------------------------------------------------------------------- 1 | const Course = require('../models/course'); 2 | // ts, injection 3 | 4 | 5 | function addStudentToCourse(studentId, courseId) { 6 | const course = await Course.findByIdAndUpdate(courseId, { 7 | student: { $push: studentId } 8 | }, { new: true }); 9 | if (!course) { 10 | throw new Error('course not found'); 11 | } 12 | return course; 13 | } 14 | 15 | 16 | module.exports = { 17 | addStudentToCourse 18 | } 19 | -------------------------------------------------------------------------------- /7-mongoose/src/routes/index.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const studentRouter = require('./student'); 3 | const courseRouter = require('./course'); 4 | const userRouter = require('./user'); 5 | const authGuard = require('../middleware/authGuard'); 6 | 7 | const v1Router = express.Router(); 8 | 9 | v1Router.use('/students', authGuard, studentRouter); 10 | v1Router.use('/courses', courseRouter); 11 | v1Router.use('/users', userRouter); 12 | 13 | module.exports = v1Router; 14 | -------------------------------------------------------------------------------- /1-node.js/home.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Document 8 | 9 | 10 |

Home Page

11 | 17 | 18 | 19 | -------------------------------------------------------------------------------- /1-node.js/other.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Document 8 | 9 | 10 |

Other Page

11 | 17 | 18 | 19 | -------------------------------------------------------------------------------- /5-api-server/src/routes/task.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const { 3 | getAllTasks, 4 | getTaskById, 5 | addTask, 6 | updateTaskById, 7 | deleteTaskById, 8 | } = require('../controllers/task'); 9 | 10 | const taskRouter = express.Router(); 11 | 12 | taskRouter.get('', getAllTasks); 13 | 14 | taskRouter.get('/:id', getTaskById); 15 | 16 | taskRouter.post('', addTask); 17 | 18 | taskRouter.put('/:id', updateTaskById); 19 | 20 | taskRouter.delete('/:id', deleteTaskById); 21 | 22 | module.exports = taskRouter; 23 | -------------------------------------------------------------------------------- /7-mongoose/src/routes/course.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const { 3 | getAllCourses, 4 | getCourseById, 5 | updateCourseById, 6 | deleteCourseById, 7 | addCourse, 8 | } = require('../controllers/Course'); 9 | 10 | const courseRouter = express.Router(); 11 | 12 | courseRouter.get('', getAllCourses); 13 | courseRouter.get('/:id', getCourseById); 14 | courseRouter.put('/:id', updateCourseById); 15 | courseRouter.delete('/:id', deleteCourseById); 16 | courseRouter.post('', addCourse); 17 | 18 | module.exports = courseRouter; 19 | -------------------------------------------------------------------------------- /7-mongoose/bcrypt.js: -------------------------------------------------------------------------------- 1 | const bcrypt = require('bcrypt'); 2 | 3 | const password = '123'; 4 | 5 | // const salt = bcrypt.genSaltSync(12); 6 | const salt = '$2b$12$IoPobvmSVnkpz.Jjw/U6s.'; 7 | // $2b$12$IoPobvmSVnkpz.Jjw/U6s. 8 | // $2b$12$IoPobvmSVnkpz.Jjw/U6s. /atUSDA.iRS3vlM1eBSMU5GZ0KK4Dyi 9 | 10 | const result = bcrypt.hashSync(password, salt); 11 | console.log(result); 12 | 13 | // console.log(result); 14 | 15 | // $2b$12$YuhzGVsj98RB2C8b//VZG.7GOsadAWa3kUxV/YEPMnLhwMudPqlO6 16 | // $2b$12$DTIBs095c8BUv/RIGY69nejHHvzwmOjmvOj6yGU/qPYzcnU2nSLUW 17 | -------------------------------------------------------------------------------- /5-api-server/.vscode/launch.json: -------------------------------------------------------------------------------- 1 | { 2 | // Use IntelliSense to learn about possible attributes. 3 | // Hover to view descriptions of existing attributes. 4 | // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 5 | "version": "0.2.0", 6 | "configurations": [ 7 | { 8 | "type": "pwa-node", 9 | "request": "launch", 10 | "name": "Launch Program", 11 | "skipFiles": [ 12 | "/**" 13 | ], 14 | "program": "${workspaceFolder}/5-api-server/src/controllers/task.js" 15 | } 16 | ] 17 | } -------------------------------------------------------------------------------- /5-api-server/src/utils/logger.js: -------------------------------------------------------------------------------- 1 | const winston = require('winston'); 2 | 3 | const logger = winston.createLogger({ 4 | level: process.env.LOGGER_LEVEL || 'info', 5 | // winston.format.simple() 6 | format: winston.format.combine( 7 | winston.format.colorize(), 8 | winston.format.timestamp({ 9 | format: 'YYYY-MM-DD HH:mm:ss', 10 | }), 11 | winston.format.printf( 12 | (info) => `${info.timestamp} ${info.level}: ${info.message}` 13 | ) 14 | ), 15 | transports: [new winston.transports.Console()], 16 | }); 17 | 18 | module.exports = logger; 19 | -------------------------------------------------------------------------------- /7-mongoose/src/utils/logger.js: -------------------------------------------------------------------------------- 1 | const winston = require('winston'); 2 | 3 | const logger = winston.createLogger({ 4 | level: process.env.LOGGER_LEVEL || 'info', 5 | // winston.format.simple() 6 | format: winston.format.combine( 7 | winston.format.colorize(), 8 | winston.format.timestamp({ 9 | format: 'YYYY-MM-DD HH:mm:ss', 10 | }), 11 | winston.format.printf( 12 | (info) => `${info.timestamp} ${info.level}: ${info.message}` 13 | ) 14 | ), 15 | transports: [new winston.transports.Console()], 16 | }); 17 | 18 | module.exports = logger; 19 | -------------------------------------------------------------------------------- /7-mongoose/src/utils/jwt.js: -------------------------------------------------------------------------------- 1 | const jwt = require('jsonwebtoken'); 2 | 3 | const { JWT_KEY } = process.env; 4 | 5 | function generateToken(payload) { 6 | return jwt.sign(payload, JWT_KEY, { expiresIn: '1h' }); 7 | } 8 | 9 | function validateToken(token) { 10 | // return jwt.verify(token, JWT_KEY); 11 | try { 12 | return jwt.verify(token, JWT_KEY); // return payload 13 | } catch (e) { 14 | return null; 15 | } 16 | } 17 | 18 | // try { 19 | 20 | // validateToken() 21 | // } catch () { 22 | 23 | // } 24 | 25 | module.exports = { generateToken, validateToken }; 26 | -------------------------------------------------------------------------------- /5-api-server/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "4-23nodeassignment", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "dev": "nodemon src/index.js" 8 | }, 9 | "keywords": [], 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "cors": "^2.8.5", 14 | "dotenv": "^16.0.1", 15 | "express": "^4.17.3", 16 | "helmet": "^5.1.0", 17 | "morgan": "^1.10.0", 18 | "swagger-jsdoc": "^6.2.1", 19 | "swagger-ui-express": "^4.4.0", 20 | "winston": "^3.7.2" 21 | }, 22 | "devDependencies": { 23 | "nodemon": "^2.0.16" 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /7-mongoose/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "4-23nodeassignment", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "dev": "nodemon src/index.js" 8 | }, 9 | "keywords": [], 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "bcrypt": "^5.0.1", 14 | "cors": "^2.8.5", 15 | "dotenv": "^16.0.1", 16 | "express": "^4.17.3", 17 | "express-async-errors": "^3.1.1", 18 | "helmet": "^5.1.0", 19 | "joi": "^17.6.0", 20 | "jsonwebtoken": "^8.5.1", 21 | "mongoose": "^6.3.5", 22 | "morgan": "^1.10.0", 23 | "winston": "^3.7.2" 24 | }, 25 | "devDependencies": { 26 | "nodemon": "^2.0.16" 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /7-mongoose/src/middleware/authGuard.js: -------------------------------------------------------------------------------- 1 | const { validateToken } = require('../utils/jwt'); 2 | 3 | module.exports = (req, res, next) => { 4 | // Authorization: Bearer {token} 5 | const authorizationHeader = req.header('Authorization'); 6 | if (!authorizationHeader) { 7 | return res.sendStatus(401); 8 | } 9 | const tokenArray = authorizationHeader.split(' '); 10 | if (tokenArray.length !== 2 || tokenArray[0] !== 'Bearer') { 11 | return res.sendStatus(401); 12 | } 13 | 14 | const payload = validateToken(tokenArray[1]); 15 | if (!payload) { 16 | return res.sendStatus(401); 17 | } 18 | req.user = payload; 19 | 20 | return next(); 21 | }; 22 | 23 | // Role based 24 | // Attribute based (operation) 25 | -------------------------------------------------------------------------------- /1-node.js/server.js: -------------------------------------------------------------------------------- 1 | const http = require('http'); 2 | const fs = require('fs'); 3 | const path = require('path'); 4 | const homePage = fs.readFileSync(path.join(__dirname, 'home.html')); 5 | const otherPage = fs.readFileSync(path.join(__dirname, 'other.html')); 6 | 7 | const server = http.createServer((req, res) => { 8 | console.log(req.url, req.headers, req.method); 9 | 10 | if (req.url === '/') { 11 | // res.setHeader('Content-Type', 'text/html'); 12 | res.write(homePage); 13 | res.end(); 14 | return; 15 | } 16 | if (req.url === '/other') { 17 | // res.setHeader('Content-Type', 'text/html'); 18 | res.write(otherPage); 19 | res.end(); 20 | return; 21 | } 22 | }); 23 | server.listen(8080); 24 | 25 | // 3000， 8000， 8080， 9000， 4200， 26 | -------------------------------------------------------------------------------- /7-mongoose/src/models/course.js: -------------------------------------------------------------------------------- 1 | const { Schema, model } = require('mongoose'); 2 | 3 | // _id: String, name, description, students 4 | module.exports = model( 5 | 'Course', 6 | new Schema({ 7 | // course code 8 | _id: { 9 | type: String, 10 | uppercase: true, 11 | alias: 'code', 12 | }, 13 | name: { 14 | type: String, 15 | required: true, 16 | }, 17 | description: { 18 | type: String, 19 | default: 'this is a description', 20 | }, 21 | students: [ 22 | { 23 | type: Schema.Types.ObjectId, 24 | ref: 'Student', 25 | }, 26 | // { 27 | // _id: { 28 | // type: Schema.Types.ObjectId, 29 | // ref: 'Student', 30 | // }, 31 | // firstName: String, 32 | // }, 33 | ], 34 | }) 35 | ); 36 | -------------------------------------------------------------------------------- /3-npm/quiz.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | 3 | const app = express(); 4 | 5 | function m1(req, res, next) { 6 | console.log('m1 called'); 7 | next(); 8 | } 9 | 10 | function m2(req, res, next) { 11 | console.log('m2 called'); 12 | next(); 13 | } 14 | 15 | function m3(req, res, next) { 16 | console.log('m3 called'); 17 | next(); 18 | } 19 | 20 | function m4(req, res, next) { 21 | console.log('m4 called'); 22 | next(); 23 | } 24 | 25 | // quiz 26 | // GET /v1/tasks/1 27 | // GET /v1/tasks 28 | 29 | // middleware chain 30 | // []; 31 | 32 | // event bubbling 33 | 34 | app.use(m1); 35 | app.use('/v1', m2); 36 | app.get('/v1/tasks', m3); 37 | app.get('/v1/tasks', m4); 38 | app.get('/v1/tasks/:id', (req, res) => { 39 | res.json(req.params); 40 | }); 41 | 42 | app.listen(3000, () => console.log('listen on 3000')); 43 | -------------------------------------------------------------------------------- /5-api-server/note.txt: -------------------------------------------------------------------------------- 1 | -- package.json 2 | -- package-lock.json 3 | -- src 4 | |-- index.js 入口文件 (server.js, app.js) 5 | |-- routes 6 | |-- tasks.js (taskRouter) (task.route.js) 7 | |-- users.js (userRouter) 8 | |-- index.js (把上面所有的router导入进来，再做一个统一的导出) 9 | |-- controllers （逻辑处理部分） 10 | |-- tasks.js (taskController) (task.controller.js) 11 | |-- users.js 12 | |-- models 13 | |-- task.js (Task.js) 数据库中Task这个数据的格式设计 - ORM （object relational mapping), 跟数据库交互 14 | |-- middleware 15 | |-- error-middleware 16 | |-- xxxErrorHandler.js 17 | |-- authGuard 18 | |-- cors 19 | |-- utils (Helper function， shared function，db) 20 | |-- db 21 | |-- config 项目配置（环境变量的处理） 22 | 23 | 24 | routes 和 controllers 合并 25 | services 26 | 27 | src 28 | - users 29 | -- user.controller.js 30 | -- user.model.js 31 | - tasks 32 | -------------------------------------------------------------------------------- /7-mongoose/src/utils/db.js: -------------------------------------------------------------------------------- 1 | const mongoose = require('mongoose'); 2 | const logger = require('./logger'); 3 | 4 | function connectToDB() { 5 | const connectionString = process.env.CONNECTION_STRING; 6 | if (!connectionString) { 7 | // throw Error() 8 | logger.error('connection string not defined'); 9 | // 正常退出 10 | // 非正常退出 11 | // 人为正常退出 process.exit(0) 12 | // 人为非正常退出 13 | process.exit(1); 14 | } 15 | const db = mongoose.connection; 16 | db.on('connected', () => { 17 | logger.info(`DB connected, ${connectionString}`); 18 | }); 19 | 20 | db.on('error', (error) => { 21 | logger.error(error.message); 22 | process.exit(2); 23 | }); 24 | 25 | db.on('disconnected', () => { 26 | logger.info('db connection lost'); 27 | }); 28 | return mongoose.connect(connectionString); 29 | } 30 | 31 | module.exports = connectToDB; 32 | -------------------------------------------------------------------------------- /4-23nodeassignment/index.js: -------------------------------------------------------------------------------- 1 | // 导入express包 2 | const express = require('express'); 3 | const app = express(); 4 | 5 | const PORT = 3000; 6 | 7 | // body-parser 8 | // 4.xxx -> body-parser included in express 9 | app.use(express.json()); // JSON 10 | // app.use(express.urlencoded({ extended: true })); 11 | 12 | // json: function(req, res, next) { } 13 | // json: () => { 14 | // // high order function 15 | // // curring function 16 | // return (req, res, next) => { 17 | 18 | // } 19 | // } 20 | // app.use(express.json()); 21 | 22 | // 导入路由 23 | const { router } = require('./router'); 24 | 25 | // 注册路由 26 | app.use(router); 27 | 28 | // 捕获错误并返回提示信息 29 | // app.use((err, req, res, next) => { 30 | // if (err) { 31 | // res.send('操作错误，请更正后再试。'); 32 | // } else next(); 33 | // }); 34 | 35 | app.listen(PORT, () => { 36 | console.log(`server is running at ${PORT}`); 37 | }); 38 | -------------------------------------------------------------------------------- /7-mongoose/src/index.js: -------------------------------------------------------------------------------- 1 | require('dotenv').config(); 2 | const express = require('express'); 3 | require('express-async-errors'); 4 | const morgan = require('morgan'); 5 | const cors = require('cors'); 6 | const helmet = require('helmet'); 7 | 8 | const v1Router = require('./routes'); 9 | const logger = require('./utils/logger'); 10 | const connectToDB = require('./utils/db'); 11 | const errorHandler = require('./middleware/errorHandler'); 12 | const validationErrorHandler = require('./middleware/validationErrorHandler'); 13 | 14 | const PORT = process.env.PORT || 3000; 15 | 16 | const app = express(); 17 | 18 | app.use(helmet()); 19 | app.use(morgan('dev')); 20 | app.use(express.json()); 21 | app.use(cors()); 22 | 23 | app.use('/v1', v1Router); 24 | 25 | app.use(validationErrorHandler); 26 | app.use(errorHandler); 27 | 28 | connectToDB(); 29 | 30 | app.listen(PORT, () => { 31 | logger.info(`server listening on port: ${PORT}`); 32 | }); 33 | -------------------------------------------------------------------------------- /5-api-server/src/index.js: -------------------------------------------------------------------------------- 1 | require('dotenv').config(); 2 | const express = require('express'); 3 | const morgan = require('morgan'); 4 | // const cors = require('./middleware/cors'); 5 | const cors = require('cors'); 6 | const helmet = require('helmet'); 7 | const swaggerUi = require('swagger-ui-express'); 8 | 9 | const v1Router = require('./routes'); 10 | const logger = require('./utils/logger'); 11 | const swaggerJsDoc = require('./utils/swagger'); 12 | 13 | const PORT = process.env.PORT || 3000; 14 | 15 | const app = express(); 16 | 17 | app.use(helmet()); 18 | app.use(morgan('dev')); 19 | app.use(express.json()); 20 | app.use(cors()); 21 | app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerJsDoc)); 22 | 23 | // GET /v1/tasks 24 | // app.use('/v1') 25 | // GET /tasks 26 | app.use(v1Router); 27 | 28 | app.listen(PORT, () => { 29 | logger.info(`server listening on port: ${PORT}`); 30 | }); 31 | 32 | // /health_check 33 | // /healthz 34 | // on-call 35 | -------------------------------------------------------------------------------- /7-mongoose/src/models/user.js: -------------------------------------------------------------------------------- 1 | const { Schema, model } = require('mongoose'); 2 | const bcrypt = require('bcrypt'); 3 | 4 | const schema = new Schema({ 5 | username: { 6 | type: String, 7 | required: true, 8 | }, 9 | password: { 10 | type: String, 11 | required: true, 12 | }, 13 | role: { 14 | type: String, 15 | }, 16 | }); 17 | 18 | schema.methods.hashPassword = async function () { 19 | this.password = await bcrypt.hash(this.password, 12); 20 | }; 21 | 22 | schema.methods.validatePassword = async function (password) { 23 | return bcrypt.compare(password, this.password); 24 | }; 25 | 26 | const Model = model('User', schema); 27 | 28 | module.exports = Model; 29 | 30 | /** 31 | * 加密，解密，哈希 32 | * encrypt, decrypt, hash 33 | * 34 | * x -> X 35 | * X -> x 36 | * 37 | * x -> Y 38 | * Y !-> x 39 | * 40 | * x' -> Y 41 | * 42 | * football -> xxxx 43 | * aaaaaaa -> bbbbbb 44 | * 45 | * 加盐 46 | * salt 47 | * football -salt1-> xxxx1salt1 48 | * football -salt2-> xxxx2salt2 49 | * 50 | */ 51 | -------------------------------------------------------------------------------- /1-node.js/index.js: -------------------------------------------------------------------------------- 1 | // console.log('hello world'); 2 | 3 | // // REPL 4 | 5 | // const moduleA = { exports: {} }; 6 | // const moduleB = { exports: {} }; 7 | // // const msg = 'secret msg'; 8 | // // const msg = 'another msg'; 9 | // (function (module) { 10 | // const msg = 'secret msg'; 11 | 12 | // function getMsg() { 13 | // return msg; 14 | // } 15 | 16 | // module.exports = { getMsg }; 17 | // })(moduleA); 18 | 19 | // (function (module) { 20 | // const msg = 'another msg'; 21 | 22 | // function getMsg() { 23 | // return msg; 24 | // } 25 | 26 | // module.exports = { getMsg }; 27 | // })(moduleB); 28 | 29 | // moduleA.exports.getMsg(); 30 | // moduleB.exports.getMsg(); 31 | // { 32 | // key: value 33 | // } 34 | 35 | // { 36 | // key: value 37 | // } 38 | 39 | const getMsgA = require('./messageA'); 40 | // const { getMsg: getMsgA } = require('./messageA'); 41 | const { getMsg: getMsgB } = require('./messageB'); 42 | getMsgA.getMsg(); 43 | getMsgB(); 44 | console.log(__dirname); 45 | console.log(__filename); 46 | // __dirname 47 | // __filename 48 | -------------------------------------------------------------------------------- /7-mongoose/src/routes/student.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const { 3 | getAllStudents, 4 | getStudentById, 5 | updateStudentById, 6 | deleteStudentById, 7 | addStudent, 8 | addStudentToCourse, 9 | removeStudentFromCourse, 10 | } = require('../controllers/student'); 11 | const adminGuard = require('../middleware/adminGuard'); 12 | 13 | const studentRouter = express.Router(); 14 | 15 | // curring function 16 | // high order function 17 | // function tryCatch(routeHandler) { 18 | // return async (req, res, next) => { 19 | // try { 20 | // await routeHandler(req, res, next); 21 | // } catch (e) { 22 | // // res.json(e); 23 | // next(e); 24 | // } 25 | // }; 26 | // } 27 | 28 | studentRouter.get('', getAllStudents); 29 | studentRouter.get('/:id', getStudentById); 30 | studentRouter.put('/:id', updateStudentById); 31 | studentRouter.delete('/:id', deleteStudentById); 32 | studentRouter.post('', adminGuard, addStudent); 33 | studentRouter.post('/:id/courses/:code', addStudentToCourse); 34 | studentRouter.delete('/:id/courses/:code', removeStudentFromCourse); 35 | 36 | module.exports = studentRouter; 37 | -------------------------------------------------------------------------------- /7-mongoose/src/controllers/user.js: -------------------------------------------------------------------------------- 1 | const User = require('../models/user'); 2 | const { generateToken } = require('../utils/jwt'); 3 | 4 | async function register(req, res) { 5 | const { username, password } = req.body; 6 | // validation 7 | // check if username duplicate 8 | // add uniq index to username 9 | const user = new User({ username, password }); 10 | // hash password 11 | await user.hashPassword(); 12 | await user.save(); 13 | const token = await generateToken({ username }); 14 | 15 | return res.json({ token }); 16 | } 17 | 18 | // fail fast 19 | 20 | async function login(req, res) { 21 | const { username, password } = req.body; 22 | const existingUser = await User.findOne({ username }).exec(); 23 | if (!existingUser) { 24 | return res.status(401).json({ error: 'invalid username or password' }); 25 | } 26 | 27 | const isPasswordValid = await existingUser.validatePassword(password); 28 | if (!isPasswordValid) { 29 | return res.status(401).json({ error: 'invalid username or password' }); 30 | } 31 | const token = await generateToken({ username, role: existingUser.role }); 32 | return res.json({ token }); 33 | } 34 | 35 | module.exports = { 36 | register, 37 | login, 38 | }; 39 | -------------------------------------------------------------------------------- /es6/index.js: -------------------------------------------------------------------------------- 1 | const obj = { 2 | greet() {}, 3 | greet1: function () {}, 4 | greet2: () => {}, 5 | }; 6 | 7 | // object literal 8 | const obj = {}; 9 | obj.greet = function () {}; 10 | obj.greet1 = function () {}; 11 | obj.greet2 = () => {}; 12 | 13 | // push, pop, shift, unshift 14 | // splice 15 | 16 | const array = [ 17 | { name: 'mason', age: 18 }, 18 | { name: 'james', age: 20 }, 19 | ]; 20 | 21 | array.find((i) => i.name === 'mason'); 22 | // { name: 'mason', age: 18 } 23 | 24 | // class inheritance 25 | // prototype pattern 26 | // 代理 delegate 27 | 28 | // Fruit getPrice() 29 | // apple.getPrice() 30 | 31 | function Person(name) { 32 | this.name = name; 33 | this.toString = function () { 34 | console.log('name: ' + this.name); 35 | }; 36 | } 37 | 38 | function Person(name) { 39 | this.name = name; 40 | this.toString = function () { 41 | console.log('name: ' + this.name); 42 | }; 43 | return undefined; 44 | } 45 | 46 | const obj = Person('mason'); 47 | obj === undefined; 48 | 49 | function Person(name) { 50 | const person = {}; 51 | // 原型链的关联 52 | person.name = name; 53 | person.toString = function () { 54 | console.log('name: ' + this.name); 55 | }; 56 | return person; 57 | } 58 | -------------------------------------------------------------------------------- /7-mongoose/src/models/student.js: -------------------------------------------------------------------------------- 1 | const { Schema, model } = require('mongoose'); 2 | const Joi = require('joi'); 3 | 4 | // firstName, lastName, email, courses 5 | 6 | const schema = new Schema({ 7 | // _id: { 8 | // type: Number, 9 | // } 10 | firstName: { 11 | type: String, 12 | required: true, 13 | minlength: 2, 14 | maxlength: 10, 15 | }, 16 | lastName: { 17 | type: String, 18 | required: true, 19 | }, 20 | email: { 21 | type: String, 22 | required: true, 23 | validate: { 24 | validator: (email) => { 25 | // regex 26 | // Joi 27 | // validator.js 28 | // express-validator 29 | // const validation = Joi.string().email().validate(email); 30 | // const { error } = validation; 31 | // if (error) { 32 | // return false; 33 | // } 34 | // return true; 35 | // 如果返回false，才是验证失败 36 | return !Joi.string().email().validate(email).error; 37 | }, 38 | msg: 'Invalid email format', 39 | }, 40 | }, 41 | courses: [ 42 | { 43 | type: String, 44 | ref: 'Course', 45 | }, 46 | ], 47 | }); 48 | 49 | const Model = model('Student', schema); 50 | 51 | module.exports = Model; 52 | -------------------------------------------------------------------------------- /es6/note.md: -------------------------------------------------------------------------------- 1 | ECMAScript 2 | ES 3 | 4 | Ecma international 5 | 6 | ES5 2009 7 | ES6 2015 8 | ES7 2016 9 | ES2022 10 | ES6+ 11 | 12 | Babel 13 | 14 | function scope 15 | globe scope 16 | block scope 块级作用域 17 | 18 | foo(); 19 | 20 | function foo(){ 21 | var fruit = 'apple'; 22 | } 23 | 24 | const obj = {}; 25 | 26 | value vs reference 27 | pass by value vs pass by reference 28 | 29 | function expression 30 | const foo = function(){}; 31 | 32 | function declaration 33 | function foo(){} 34 | 35 | back tick 36 | `` 37 | '' 38 | 39 | 解构赋值 40 | 41 | const fruit = {name: 'apple', price: 12, color: 'green'}; 42 | const {name, ...rest} = fruit; 43 | rest = {price: 12, color: 'green'}; 44 | 45 | shallow/deep clone 46 | const fruit = {name: 'apple', price: 12, color: 'green', location: {city: 'brisbane'}}; 47 | const newFruit = {...fruit}; 48 | 49 | newFruit.name = 'pear'; 50 | fruit.name => 'apple' 51 | newFruit.location.city = 'sydney'; 52 | fruit.location.city => sydney; 53 | 54 | lodash 55 | 56 | const add = (x, y) => { 57 | return {sum: x + y}; 58 | }; 59 | // equals 60 | const add = (x, y) => ({sum: x + y}); 61 | 62 | lexical scope 63 | 64 | context 65 | 66 | const calendar = { 67 | currentDay: 6, 68 | nextDay() { 69 | const cb = () => { 70 | this.currentDay++; 71 | console.log(this.currentDay); 72 | }; 73 | setTimeout(cb); 74 | }, 75 | }; 76 | calendar.nextDay(); 77 | -------------------------------------------------------------------------------- /6-mongodb/note.md: -------------------------------------------------------------------------------- 1 | SQL non-SQL 2 | 3 | SQL structured query language 4 | 关系型数据库 5 | 6 | non-sql 7 | no-sql 8 | not only sql 9 | 10 | SQL 11 | MySQL 12 | PostgresQL 13 | SQLite 14 | 15 | non-SQL 16 | 17 | document-oriented -> mongodb 18 | key-value -> redis 19 | graph-oriented -> neo4j 20 | column-family -> cassandra 21 | 22 | mongo 23 | humongous 24 | 25 | { 26 | \_id: ObjectId, 27 | 28 | } 29 | 30 | BSON - Binary JSON 31 | 32 | [ 33 | { 34 | _id: xxx1, 35 | name: yyy, 36 | age: 10, 37 | dob: xxxx 38 | }, 39 | { 40 | _id: xxx2, 41 | username: yyy 42 | } 43 | ] 44 | 45 | [0,100] 0....100 46 | (0, 100) 1...99 47 | 48 | A, B 49 | A B 1:1 50 | B A 1:1 51 | 52 | A B 1:N 53 | B A 1:1 54 | 55 | A B 1:N 56 | B A 1:N 57 | 58 | A1 B1 59 | A2 B2 60 | 61 | A1 B1 62 | A1 B2 63 | A2 B1 64 | A2 B2 65 | M:N 66 | 67 | students 68 | teachers 69 | courses 70 | 71 | C -> S 1:N 72 | S -> C 1:N 73 | C - S M:N 74 | T -> C 1:1 75 | C -> T 1:1 76 | 77 | T -> C 1:1 78 | C -> T 1:N 79 | 80 | S1,S2, 81 | C1,C2 82 | 83 | students collection 84 | [ 85 | { 86 | \_id: "S1", 87 | courses: [ 88 | { 89 | _id: "C1", 90 | name: "New Course 1", 91 | }, 92 | { 93 | _id: "C2", 94 | } 95 | ] 96 | }, 97 | { 98 | \_id: "S2", 99 | courses: [ 100 | { 101 | _id: "C1", 102 | name: "New Course 1", 103 | }, 104 | { 105 | _id: "C2", 106 | } 107 | ] 108 | } 109 | ] 110 | 111 | [ 112 | { 113 | _id: "C1", 114 | name: "New Course 1", 115 | }, 116 | { 117 | _id: "C2", 118 | } 119 | ] 120 | 121 | [ 122 | d1,d2,d3,d4 123 | ] 124 | 125 | airplane 126 | 127 | mapping 128 | [ 129 | {name: 'apple', mapping: d3},d1,d2,d4 130 | ] 131 | 132 | 10000 10000 133 | 10000 10 134 | 135 | [d1,d2,d3] 136 | [d1,d3] first pipe 137 | [d1,d3,d4] second pipe 138 | [d1',d3',d4'] third pipe 139 | [d1',d3',d4'] 140 | -------------------------------------------------------------------------------- /2-restful/note.md: -------------------------------------------------------------------------------- 1 | HTTP 2 | 3 | 0.9 4 | 1.0 5 | 1.1 - 6 | 2 - 7 | 3 8 | HTTP 9 | HTTP2 -> HTTPS 10 | 11 | TCP - UDP 12 | 13 | URL uniform resource identifier 统一资源标识符 14 | 15 | mongodb 16 | file 17 | smtp 18 | ftp 19 | http 20 | 21 | ip whitelisting 22 | 23 | https 443 24 | http 80 25 | 26 | GET -> 获取数据 -> Read 27 | POST -> 数据添加 -> Create 28 | PUT -> 更新数据，数据替换 -> Update 29 | DELETE -> 删除数据 -> Delete 30 | PATCH -> 更新数据，只更新部分数据 31 | 32 | CRUD -> 增删改查 33 | 34 | request: 35 | METHOD PATH PROTOCOL 36 | root 37 | 38 | response: 39 | PROTOCOL Status code(状态码) 40 | 41 | https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Messages#http_%E8%AF%B7%E6%B1%82 42 | 报文 43 | 44 | client [browser, server, cmd line] 45 | server 46 | 47 | preflight 48 | 49 | x-custom-header 50 | 51 | C - P - S 52 | C - S 53 | https://s.com 54 | https://p.com/?url=https://s.com 55 | 56 | 204 no content 57 | 209 conflicts 58 | 59 | 序列化与反序列化 60 | 61 | public api server 62 | web server 63 | 64 | api server 65 | 66 | GET /books 67 | 68 | 无状态 69 | A,B 70 | B,A 71 | 72 | rpc 73 | 74 | Restful api 设计规范(建议) 75 | 76 | 1. versioning (版本) 77 | example.com/api/v1 78 | example.com/v1 79 | example.com/v2/books 80 | 81 | 2. url 里，尽量使用名词 noun，不要使用动词, 资源尽量使用复数形式 82 | GET /v1/books 83 | GET /v1/getBooks x 84 | 85 | 3. 保证 GET 不会对资源进行修改（污染） 86 | GET /v1/books (只读数据，而不做更新或添加) 87 | 88 | 4. url 推荐使用嵌套结构 89 | GET /posts/:postId/comments 90 | GET /posts/{postId}/comments 91 | GET /posts/post123/comments 92 | 93 | 5. 对返回的数据进行分页（注意返回的大小） 94 | 1000 个数据 95 | 把数据分层 100 页，每页 10 个 96 | GET /v1/books -> 10 个数据 97 | GET /v1/books?page=2&pageSize=100 -> 100 个数据 98 | 99 | 6. 使用正确的 status code 来表示返回的结果 100 | 101 | 7. 尽量返回人性化的文本信息（错误信息） 102 | {"error":"invalid password"} 103 | {"error": 1001} // error code 104 | 105 | sequence diagram 106 | 107 | monolith server 108 | -------------------------------------------------------------------------------- /async/promis-quiz.md: -------------------------------------------------------------------------------- 1 | 1 2 | 3 | ```js 4 | setTimeout(() => console.log(1)); 5 | Promise.resolve().then(() => console.log(2)); 6 | setTimeout(() => { 7 | console.log(3); 8 | Promise.resolve().then(() => console.log(3.1)); 9 | }); 10 | setTimeout(() => console.log(4)); 11 | Promise.resolve().then(() => { 12 | console.log(5); 13 | Promise.resolve().then(() => console.log(5.1)); 14 | setTimeout(() => console.log(5.2)); 15 | }); 16 | Promise.resolve().then(() => console.log(6)); 17 | ``` 18 | 19 | 2 20 | 21 | ```js 22 | Promise.resolve().then(() => console.log(1)); 23 | Promise.resolve().catch(() => console.log(2)); 24 | Promise.resolve() 25 | .then(() => console.log(3)) 26 | .then(() => console.log(3.1)); 27 | Promise.reject().catch(() => console.log(4)); 28 | Promise.resolve() 29 | .then(() => console.log(5)) 30 | .catch(() => console.log(5.1)); 31 | Promise.resolve() 32 | .catch(() => console.log(6)) 33 | .then(() => console.log(6.1)); 34 | Promise.reject() 35 | .then(() => console.log(7)) 36 | .catch(() => console.log(7.1)); 37 | Promise.reject() 38 | .catch(() => console.log(8)) 39 | .then(() => console.log(8.1)); 40 | ``` 41 | 42 | 3 43 | 44 | ```js 45 | setTimeout(() => console.log(1)); 46 | new Promise((res, rej) => { 47 | console.log(2); 48 | setTimeout(() => console.log(2.1)); 49 | res(); 50 | }).then(() => console.log(2.2)); 51 | setTimeout(() => { 52 | console.log(3); 53 | new Promise((res, rej) => { 54 | console.log(3.1); 55 | setTimeout(() => console.log(3.2)); 56 | rej(); 57 | }) 58 | .then(() => console.log(3.3)) 59 | .catch(() => console.log(3.4)); 60 | }); 61 | Promise.resolve().then(() => console.log(4)); 62 | setTimeout(() => { 63 | console.log(5); 64 | setTimeout(() => console.log(5.1)); 65 | Promise.resolve().then(() => { 66 | setTimeout(() => console.log(5.2)); 67 | console.log(5.3); 68 | }); 69 | }); 70 | ``` 71 | 72 | 4 73 | 74 | ```js 75 | async function foo() { 76 | console.log(1); 77 | await bar(); 78 | console.log(2); 79 | } 80 | 81 | async function bar() { 82 | console.log(3); 83 | const a = await 4; 84 | console.log(a); 85 | } 86 | 87 | console.log(5); 88 | foo(); 89 | console.log(6); 90 | ``` 91 | -------------------------------------------------------------------------------- /7-mongoose/src/controllers/course.js: -------------------------------------------------------------------------------- 1 | const Course = require('../models/course'); 2 | const Joi = require('joi'); 3 | 4 | async function getAllCourses(req, res) { 5 | // try { 6 | const courses = await Course.find().exec(); 7 | return res.json(courses); 8 | // } catch (e) { 9 | 10 | // 11 | // } 12 | 13 | // Course.find().exec().then((res)=>{}).catch((err)=>{}) 14 | 15 | // Course.find((error, result) => { 16 | // if (error) { 17 | // return .... 18 | // } 19 | // // result handling 20 | // }) 21 | } 22 | 23 | async function getCourseById(req, res) { 24 | const { id } = req.params; 25 | const course = await Course.findById(id) 26 | .populate('students', { firstName: 1 }) 27 | .exec(); 28 | if (!course) { 29 | return res.status(404).json({ error: 'Course not found' }); 30 | } 31 | return res.json(course); 32 | } 33 | 34 | async function addCourse(req, res) { 35 | // const { code, name, description } = req.body; 36 | const schema = Joi.object({ 37 | name: Joi.string().min(2).max(10).required(), 38 | // COMP1001 SCI2002 39 | code: Joi.string() 40 | .regex(/^[a-zA-Z]+[0-9]+$/) 41 | .required(), 42 | description: Joi.string(), 43 | }); 44 | const { code, name, description } = await schema.validateAsync(req.body, { 45 | allowUnknown: true, 46 | stripUnknown: true, 47 | }); 48 | 49 | const existingCourse = await Course.findById(code).exec(); 50 | if (existingCourse) { 51 | return res.status(409).json({ error: 'duplicate course code' }); 52 | } 53 | const course = new Course({ name, code, description }); 54 | await course.save(); 55 | return res.status(201).json(course); 56 | } 57 | 58 | async function updateCourseById(req, res) { 59 | const { id } = req.params; 60 | const { name, description } = req.body; 61 | const course = await Course.findByIdAndUpdate( 62 | id, 63 | { name, description }, 64 | { new: true } 65 | ).exec(); 66 | if (!course) { 67 | return res.status(404).json({ error: 'Course not found' }); 68 | } 69 | return res.json(course); 70 | } 71 | 72 | async function deleteCourseById(req, res) { 73 | const { id } = req.params; 74 | const course = await Course.findByIdAndDelete(id).exec(); 75 | if (!course) { 76 | return res.status(404).json({ error: 'Course not found' }); 77 | } 78 | return res.sendStatus(204); 79 | } 80 | 81 | module.exports = { 82 | getAllCourses, 83 | getCourseById, 84 | updateCourseById, 85 | deleteCourseById, 86 | addCourse, 87 | }; 88 | 89 | // app - CMS content management system 90 | -------------------------------------------------------------------------------- /async/index.js: -------------------------------------------------------------------------------- 1 | function fetchData(url, cb) { 2 | setTimeout(() => { 3 | console.log('cb', url); 4 | cb(url); 5 | }); 6 | } 7 | 8 | const cb = (data1) => { 9 | // 10 | // 11 | // 12 | // 13 | // if () {} 14 | const cb2 = (data2) => { 15 | fetchData('example.com/3', (data3) => { 16 | fetchData('example.com/4', (data4) => {}); 17 | }); 18 | }; 19 | fetchData('example.com/2', cb2); 20 | }; 21 | // callback hell 22 | fetchData('example.com/1', cb); 23 | 24 | // Promise 25 | /** 26 | * 三种状态 27 | * pending resolved(fulfilled) rejected 28 | * 29 | * 状态不可逆 30 | * pending -> resolved 31 | * pending -> rejected 32 | * 33 | * 34 | */ 35 | // resolve 36 | // reject 37 | // const promise = new Promise((res, rej) => { 38 | // res([]); 39 | // // rej({}) 40 | // }) 41 | 42 | // // promise chain 43 | // promise.then((data) => { 44 | // // data = []; 45 | 46 | // return {}; 47 | // // return new Promise() // async call 48 | // }).then(() => { 49 | 50 | // }).catch((err) => { 51 | // // err = {} 52 | // return {}; // promise 53 | // }).then().catch() 54 | 55 | function fetchDataPromise(url) { 56 | return new Promise((res, rej) => { 57 | // setTimeout(() => { 58 | console.log('promise', url); 59 | rej(url); 60 | // if () { 61 | // rej() 62 | // } 63 | // }); 64 | }); 65 | } 66 | 67 | const isLoading = false; 68 | 69 | isLoading = true; 70 | const promise = fetchDataPromise('example.com/1'); 71 | promise 72 | .then((data1) => { 73 | return fetchDataPromise('example.com/2'); 74 | }) 75 | .then((data2) => { 76 | return fetchDataPromise('example.com/3'); 77 | }) 78 | .then((data3) => { 79 | return fetchDataPromise('example.com/4'); 80 | }) 81 | .then((data4) => { 82 | return fetchDataPromise('example.com/5'); 83 | }) 84 | .catch((err) => { 85 | console.log(err); 86 | }) 87 | .finally(() => { 88 | isLoading = false; 89 | }); 90 | 91 | // promise queue / micro task queue 92 | // macro task queue 93 | // [p2], [cb1] 94 | 95 | // async await 96 | // syntax sugar 97 | 98 | async function main() { 99 | // fetchDataPromise().then().then() 100 | try { 101 | // 102 | const result = await fetchDataPromise(); 103 | // 104 | const result2 = await fetchDataPromise(); 105 | } catch (e) { 106 | console.log(e); 107 | } finally { 108 | } 109 | // ... 110 | } 111 | 112 | main(); 113 | // (async () => { 114 | // const result = await fetchDataPromise(); 115 | // })() 116 | -------------------------------------------------------------------------------- /4-23nodeassignment/router.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const router = express.Router(); 3 | 4 | // 数据暂存 5 | const tasks = []; 6 | let id = 1; 7 | // let flag = false; 8 | 9 | // {data: , error:, status: } 10 | // 获取全部任务 11 | router.get('/tasks', (req, res) => { 12 | // // 判断是否有任务，没有则返回相关信息并跳出查询 13 | // if (tasks.length === 0) { 14 | // res.send('当前还没有任务，请新建任务后再查询。'); 15 | // return; 16 | // } 17 | // array.filter() 18 | // ''.includes('') 19 | 20 | let tempArr = []; 21 | for (let i = 0; i < tasks.length; i++) { 22 | if (typeof tasks[i] !== 'string') { 23 | tempArr.push(tasks[i]); 24 | } 25 | } 26 | // 如果有，返回全部任务 27 | res.send(tempArr); 28 | }); 29 | 30 | // 获取指定任务 31 | router.get('/tasks/:id', (req, res) => { 32 | // 任务id是否存在 33 | if (req.params.id > 0 && req.params.id <= tasks.length) { 34 | // 判断任务是否已经完成 35 | if (tasks[req.params.id - 1].done) { 36 | res.send(`你查询的id为${req.params.id}的任务已完成。`); 37 | return; 38 | } 39 | // 存在，返回指定任务 40 | res.send(tasks[req.params.id - 1]); // 这里想用array.filter()/find()来实现，但一直返回空值，只能先用笨办法 41 | } else { 42 | // 不存在，返回无此任务的信息 43 | res.status(404).send(`你查询的id为${req.params.id}的任务不存在。`); 44 | } 45 | }); 46 | 47 | // 添加任务 48 | router.post('/tasks', (req, res) => { 49 | // 生成任务描述 50 | let taskString = 'tasks No.' + id; 51 | // 向数组添加任务数据 52 | tasks.push({ id: id++, description: taskString, done: false }); 53 | // ++id, id++ 54 | // id自增 55 | // id++; 56 | res.status(201).send(tasks); 57 | }); 58 | 59 | // 更新指定任务 60 | router.put('/tasks/:id', (req, res) => { 61 | const { description, done } = req.body; 62 | const elementIndex = array.findIndex((i) => Number(id) === i.id); 63 | tasks[elementIndex].description = description; 64 | // negation 65 | // const a = '123'; !a => false 66 | tasks[elementIndex].done = !!done; 67 | if (req.params.id > 0 && req.params.id <= tasks.length) { 68 | // tasks[req.params.id - 1].done = !flag; 69 | res.send(tasks[req.params.id - 1]); 70 | } else { 71 | res.status(404).send(`你要更新的id为${req.params.id}的任务不存在。`); 72 | } 73 | }); 74 | 75 | // 删除指定任务 76 | router.delete('/tasks/:id', (req, res) => { 77 | // id -> string 78 | // === false -> string === number 79 | // array.find() 80 | if (req.params.id > 0 && req.params.id <= tasks.length) { 81 | tasks.splice( 82 | req.params.id - 1, 83 | 1, 84 | `id为${req.params.id}任务不存在或已删除` 85 | ); 86 | res.status(204).send(`你删除的任务id为${req.params.id}`); 87 | } else { 88 | res.status(404).send(`你要删除的id为${req.params.id}的任务不存在。`); 89 | } 90 | }); 91 | 92 | module.exports = { router }; 93 | -------------------------------------------------------------------------------- /5-api-server/src/controllers/task.js: -------------------------------------------------------------------------------- 1 | const tasks = []; 2 | class Task { 3 | constructor(id, description) { 4 | this.id = id; 5 | this.description = description; 6 | this.done = false; 7 | } 8 | } 9 | let _id = 1; 10 | 11 | // yaml 12 | 13 | /** 14 | * @swagger 15 | * components: 16 | * schemas: 17 | * Task: 18 | * type: Object 19 | * required: 20 | * - description 21 | * properties: 22 | * id: 23 | * type: string 24 | * description: auto generated unique identifier 25 | * description: 26 | * type: string 27 | * description: description of the task 28 | * done: 29 | * type: boolean 30 | * description: status of the task 31 | * example: 32 | * id: 1 33 | * description: task 1 34 | * done: false 35 | */ 36 | 37 | /** 38 | * @swagger 39 | * /tasks: 40 | * get: 41 | * summary: return all tasks 42 | * tags: [Tasks] 43 | * parameters: 44 | * - name: description 45 | * in: query 46 | * description: filter tasks by description 47 | * schema: 48 | * type: string 49 | * responses: 50 | * 200: 51 | * description: array of tasks 52 | * content: 53 | * application/json: 54 | * schema: 55 | * type: array 56 | * items: 57 | * $ref: '#/components/schemas/Task' 58 | * 59 | */ 60 | const getAllTasks = (req, res) => { 61 | const { description } = req.query; 62 | if (description) { 63 | const filteredTasks = tasks.filter((e) => 64 | e.description.includes(description) 65 | ); 66 | res.json(filteredTasks); 67 | return; 68 | } 69 | res.json(tasks); 70 | return; 71 | }; 72 | 73 | const getTaskById = (req, res) => { 74 | const { id } = req.params; 75 | // var != null -> null / undefined 76 | // +id 77 | // NaN -> not a number 78 | const task = tasks.find((e) => e.id === Number(id)); 79 | if (!task) { 80 | res.status(404).json({ error: 'Task not found' }); 81 | return; 82 | } 83 | res.json(task); 84 | // task ? res.json(task) : res.status(404).json({ error: 'Task not found' }); 85 | // return; 86 | }; 87 | 88 | const addTask = (req, res) => { 89 | const { description } = req.body; 90 | const task = new Task(_id++, description); 91 | tasks.push(task); 92 | res.status(201).json(task); 93 | return; 94 | }; 95 | 96 | const updateTaskById = (req, res) => { 97 | const { id } = req.params; 98 | // req.body = {description: 'xxxx'}; 99 | const { description, done } = req.body; 100 | 101 | const task = tasks.find((e) => e.id === Number(id)); 102 | if (!task) { 103 | res.status(404).json('Task not found'); 104 | return; 105 | } 106 | if (description) { 107 | task.description = description; 108 | } 109 | if (done) { 110 | task.done = !!done; 111 | } 112 | res.json(task); 113 | return; 114 | }; 115 | 116 | const deleteTaskById = (req, res) => { 117 | const { id } = req.params; 118 | const index = tasks.findIndex((i) => i.id === Number(id)); 119 | if (index === -1) { 120 | res.status(404).json({ error: 'Task not found' }); 121 | return; 122 | } 123 | tasks.splice(index, 1); 124 | res.sendStatus(204); 125 | return; 126 | }; 127 | 128 | module.exports = { 129 | getAllTasks, 130 | getTaskById, 131 | updateTaskById, 132 | deleteTaskById, 133 | addTask, 134 | }; 135 | -------------------------------------------------------------------------------- /7-mongoose/src/controllers/student.js: -------------------------------------------------------------------------------- 1 | const Course = require('../models/course'); 2 | const Student = require('../models/student'); 3 | 4 | // dependency injection 5 | // decorators 6 | 7 | // subscribe, unsubscribe 8 | 9 | // debounce 200ms 10 | 11 | async function getAllStudents(req, res) { 12 | // db.students.find() 13 | // query 14 | // query chain 15 | // .sort().limit() -> pagination 16 | const students = await Student.find() 17 | .select({ firstName: 1, lastName: 1 }) 18 | .exec(); 19 | // const query = Student.find(); 20 | // if (process.env.NODE_ENV === 'production') { 21 | // query.select('firstName lastName'); 22 | // } 23 | // const students = await query.exec(); 24 | 25 | /** 26 | * { 27 | * data: [], 28 | * error: "", 29 | * message: "" 30 | * } 31 | * 32 | * res.json({ data: students }) 33 | */ 34 | return res.json(students); 35 | } 36 | 37 | async function getStudentById(req, res) { 38 | const { id } = req.params; 39 | const student = await Student.findById(id).exec(); 40 | if (!student) { 41 | return res.status(404).json({ error: 'student not found' }); 42 | } 43 | return res.json(student); 44 | } 45 | 46 | async function addStudent(req, res) { 47 | const { firstName, lastName, email } = req.body; 48 | // data validation 49 | const student = new Student({ firstName, lastName, email }); 50 | // try { 51 | 52 | await student.save(); 53 | return res.status(201).json(student); 54 | // } catch (e) { 55 | // next(e); 56 | // return res.status(400).json(e); 57 | // } 58 | } 59 | 60 | async function updateStudentById(req, res) { 61 | const { id } = req.params; 62 | const { firstName, lastName, email } = req.body; 63 | // data validation 64 | const student = await Student.findByIdAndUpdate( 65 | id, 66 | { firstName, lastName, email }, 67 | { new: true } 68 | ).exec(); 69 | if (!student) { 70 | // return next(new DocumentNotFound('student', '_id')); 71 | return res.status(404).json({ error: 'student not found' }); 72 | } 73 | return res.json(student); 74 | } 75 | 76 | async function deleteStudentById(req, res) { 77 | const { id } = req.params; 78 | const student = await Student.findByIdAndDelete(id).exec(); 79 | if (!student) { 80 | return res.status(404).json({ error: 'student not found' }); 81 | } 82 | await Course.updateMany({ students: id }, { $pull: { students: id } }).exec(); 83 | return res.sendStatus(204); 84 | } 85 | 86 | async function addStudentToCourse(req, res) { 87 | // get student and course id 88 | const { id, code } = req.params; 89 | const course = await Course.findById(code).exec(); 90 | let student = await Student.findById(id).exec(); 91 | if (!student || !course) { 92 | return res.status(404).json({ error: 'student or course not found' }); 93 | } 94 | // student.courses.addToSet(code); 95 | // await student.save(); 96 | // const courseName = course.name; 97 | student = await Student.findByIdAndUpdate( 98 | id, 99 | { $push: { courses: code } }, 100 | { new: true } 101 | ).exec(); 102 | course.students.addToSet(id); 103 | await course.save(); 104 | 105 | return res.json(student); 106 | } 107 | 108 | async function removeStudentFromCourse(req, res) { 109 | // get student and course id 110 | const { id, code } = req.params; 111 | const course = await Course.findById(code).exec(); 112 | let student = await Student.findById(id).exec(); 113 | if (!student || !course) { 114 | return res.status(404).json({ error: 'student or course not found' }); 115 | } 116 | // student.courses.includes(code) 117 | student = await Student.findByIdAndUpdate( 118 | id, 119 | { $pull: { courses: code } }, 120 | { new: true } 121 | ).exec(); 122 | await Course.findByIdAndUpdate(code, { $pull: { students: id } }).exec(); 123 | 124 | return res.json(student); 125 | } 126 | 127 | module.exports = { 128 | getAllStudents, 129 | getStudentById, 130 | updateStudentById, 131 | deleteStudentById, 132 | addStudent, 133 | addStudentToCourse, 134 | removeStudentFromCourse, 135 | }; 136 | -------------------------------------------------------------------------------- /3-npm/index.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | 3 | const app = express(); 4 | 5 | // application level middleware 6 | app.use(express.json()); 7 | // use applies to all methods 8 | 9 | // app.get('/', m1); 10 | // app.get('/', m1,m2,m3,m4, (req, res) => { 11 | 12 | const tasks = []; 13 | 14 | let id = 1; 15 | 16 | // request -> GET /v1/tasks 17 | // app.get('/v1/tasks') 18 | // match 19 | 20 | // request -> GET /v1/tasks 21 | // app.post('/v1/tasks') 22 | // not match 23 | 24 | // request -> GET /v1/tasks 25 | // app.get('/v1') 26 | // not match 27 | 28 | // request -> GET /v1/tasks 29 | // regex, * 30 | // app.use('/v1/tasks') 31 | // /v1/tasks /v1/tasks/:id /v1/tasks/xxxxxx 32 | // match 33 | 34 | // { 35 | // "id": 1, 36 | // "description": "task No.1", 37 | // "done": false - 默认false 38 | // } 39 | 40 | // req, res, next 41 | // application.method(path, callback function - route handler) 42 | app.get('/', (req, res) => { 43 | // if (true) { 44 | // res.send('hello world!!!!!!!!!'); 45 | // return; 46 | // } 47 | // 1 48 | // res.send('hello world'); 49 | // return; 50 | // 2 51 | return res.send('hello world'); 52 | // res.json({name: "mason"}) (默认 200 status code) 53 | // 只返回 status code 54 | // res.sendStatus(204); 55 | // 只设置status code 56 | // res.status(201).json({}) 57 | }); 58 | 59 | /** 60 | * 从request里取数据 61 | * 1. body -> POST, PUT, PATCH 62 | * req.body (必须使用express.json() middleware) 63 | * 2. query param -> GET (?) 64 | * req.query 65 | * 3. route param -> GET, POST, PUT, DELETE (大多数情况都是id) 66 | * /:id 67 | */ 68 | app.post('/:id', (req, res) => { 69 | // req.body = {name: "mason"} 70 | // const name = req.body.name; 71 | const { name } = req.body; 72 | // console.log(name) // "mason" 73 | const { title } = req.query; 74 | const { id } = req.params; 75 | 76 | // let key = 'a'; 77 | // key = 'b'; 78 | // const obj = {[key]:name} 79 | 80 | res.send({ name, title, id }); 81 | // {name: name} -> {name} 82 | }); 83 | // app.put 84 | // app.delete 85 | 86 | const authGuard = (req, res, next) => { 87 | // get token from request header 88 | // extract user info from token or from db 89 | req.user = userInfo; 90 | next(); 91 | }; 92 | 93 | const m1 = (req, res, next) => { 94 | // req.user -> userInfo 95 | // if (error exists) { 96 | // next(new Error('xxx')); 97 | // return; 98 | // } 99 | // if token not exist { 100 | // res.json({ error: "token not found" }); 101 | // xxxxx can be string, can be object {type:xxx, message:xxxx}, can be new Error(''); 102 | // next(new Error('error')); 103 | // next(xxxx); (no need) 104 | // return; 105 | // } 106 | next(); 107 | }; 108 | 109 | // only target validation error 110 | const errorM1 = (error, req, res, next) => { 111 | // if (error.type === 'validationError') { 112 | // res.status(400).json({ error: error.message }); 113 | // return; 114 | // } 115 | // if (error instanceof CustomError) { 116 | // res.status(400).json({ error: error.message }); 117 | // return; 118 | // } 119 | next(error); 120 | }; 121 | 122 | const errorHandler = (err, req, res, next) => { 123 | console.log(err); // logging lib -> db -> log -> logging platform 124 | res.status(500).json({ error: 'please try later' }); 125 | }; 126 | 127 | // next(new CustomError('')); 128 | class CustomError extends Error {} 129 | 130 | // const error = new ValidationError(); 131 | class ValidationError extends CustomError { 132 | constructor() { 133 | super(); 134 | } 135 | } 136 | 137 | const taskRouter = express.Router(); 138 | // mini-app 139 | taskRouter.get('/', (req, res) => { 140 | res.json([1, 2, 3]); 141 | }); 142 | 143 | // route handler 144 | const v1Router = express.Router(); 145 | v1Router.use('/tasks', taskRouter); 146 | app.use('/v1', v1Router); 147 | 148 | app.use(errorM1); 149 | // app.use(errorM2); 150 | app.use(errorHandler); 151 | 152 | app.listen(3000); 153 | 154 | // template engine 155 | 156 | const cors = (req, res, next) => { 157 | res.setHeader('Access-Control-Allow-Origin', '*'); 158 | res.setHeader('Access-Control-Allow-Headers', 'content-type'); 159 | res.setHeader('Access-Control-Allow-Methods', '*'); 160 | next(); 161 | }; 162 | 163 | app.use(cors); 164 | 165 | // function cors(){} 166 | 167 | // const taskRouter = 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"sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=" 372 | } 373 | } 374 | } 375 | -------------------------------------------------------------------------------- /es6/es6.md: -------------------------------------------------------------------------------- 1 | # ES6+ 2 | 3 | - [var vs let and const](#let-and-const) 4 | - [Template String](#template-string) 5 | - [Spread operator](#spread-operator) 6 | - [Destructuring](#destructuring) 7 | - [Default parameters](#default-parameters) 8 | - [Arrow function](#arrow-function) 9 | - [this](#this) 10 | - [Common array operations](#common-array-operations) 11 | - [Set](#set) 12 | - [Classes](#classes) 13 | - [Closure](#closure) 14 | 15 | ## var vs let and const 16 | 17 | They all used for variable declaration, the main difference is the scope. 18 | 19 | ### var 20 | 21 | #### Scope 22 | 23 | var is function scoped, it means if the variable is declared within a function, it can be accessed within the function. Similarly, if var is used outside of the function, the variable can be accessed in via window object. (in the browser) 24 | 25 | ```js 26 | var apple = 'apple'; 27 | function foo() { 28 | var pear = 'pear'; 29 | console.log(apple); // apple 30 | console.log(pear); // pear 31 | } 32 | console.log(apple); // apple 33 | console.log(pear); // Uncaught ReferenceError: pear is not defined 34 | ``` 35 | 36 | #### Re-declare and update 37 | 38 | ```js 39 | var fruit = 'apple'; 40 | var fruit = 'pear'; 41 | console.log(fruit); // pear 42 | fruit = 'grape'; 43 | console.log(fruit); // grape 44 | ``` 45 | 46 | #### Hoisting 47 | 48 | ```js 49 | console.log(fruit); // undefined 50 | var fruit = 'apple'; 51 | ``` 52 | 53 | equals 54 | 55 | ```js 56 | var fruit; 57 | console.log(fruit); // undefined 58 | fruit = 'apple'; 59 | ``` 60 | 61 | #### Problem 62 | 63 | ```js 64 | var fruit = 'apple'; 65 | if (true) { 66 | // think about this is in another file 67 | var fruit = 'pear'; 68 | } 69 | console.log(fruit); // pear 70 | ``` 71 | 72 | ### let 73 | 74 | #### Scope 75 | 76 | let is block scoped. A block is a chunk of code wrapped by currly brackets `{}` 77 | for example: 78 | `function() {// this is a block}` 79 | `if(true) {// this is also a block}` 80 | let's reuse the example above but replace the keyword with _let_ 81 | 82 | ```js 83 | let fruit = 'apple'; 84 | if (true) { 85 | let fruit = 'pear'; 86 | } 87 | console.log(fruit); // apple 88 | ``` 89 | 90 | #### Re-declare and update 91 | 92 | ```js 93 | let fruit = 'apple'; 94 | // let fruit = "pear"; // Uncaught SyntaxError: Identifier 'fruit' has already been declared 95 | fruit = 'grape'; 96 | console.log(fruit); // grape 97 | ``` 98 | 99 | #### Hoisting 100 | 101 | ```js 102 | console.log(fruit); // Uncaught ReferenceError: Cannot access 'fruit' before initialization 103 | let fruit = 'apple'; 104 | ``` 105 | 106 | Different to _var_, let is hoisted, but the vairable is not initialized 107 | 108 | ### const 109 | 110 | Scope and the hoisting is the same as _let_ 111 | 112 | #### Re-declare 113 | 114 | ```js 115 | const fruit = 'apple'; 116 | // const fruit = "pear"; // Uncaught SyntaxError: Identifier 'fruit' has already been declared 117 | fruit = 'grape'; // Uncaught TypeError: Assignment to constant variable. 118 | console.log(fruit); 119 | ``` 120 | 121 | #### Update 122 | 123 | ```js 124 | const fruit = { name: 'apple', color: 'red' }; 125 | // fruit = {name: "apple", color: "green"}; // Uncaught TypeError: Assignment to constant variable. 126 | fruit.color = 'green'; 127 | console.log(fruit); // {name: "apple", color: "green"} 128 | ``` 129 | 130 | similar in array 131 | 132 | ```js 133 | const fruits = []; 134 | // fruits = ["apple"]; // Error 135 | fruits.push('apple'); 136 | console.log(fruits); // ["apple"] 137 | ``` 138 | 139 | ### Others 140 | 141 | ```js 142 | console.log(fruit); // Uncaught ReferenceError: fruit is not defined 143 | ``` 144 | 145 | ### Quiz 146 | 147 | 1. What's the output of the following code 148 | 149 | ```js 150 | var i = 5; 151 | for (var i = 0; i < 3; i++) { 152 | console.log(i); 153 | } 154 | console.log(i); 155 | ``` 156 | 157 | 2. What's the output of the following code 158 | 159 | ```js 160 | let i = 5; 161 | for (let i = 0; i < 3; i++) { 162 | console.log(i); 163 | } 164 | console.log(i); 165 | ``` 166 | 167 | 3. 168 | 169 | ```js 170 | var arr = [10, 12, 15, 21]; 171 | for (var i = 0; i < arr.length; i++) { 172 | setTimeout(function () { 173 | console.log('Index: ' + i + ', element: ' + arr[i]); 174 | }, 1000); 175 | } 176 | ``` 177 | 178 | ### Conclusion 179 | 180 | | keyword | scope | re-declare | update | hoisting | 181 | | ------- | -------- | ---------- | ------ | --------------------- | 182 | | var | function | Yes | Yes | Yes (undefined) | 183 | | let | block | No | Yes | Yes (not initialized) | 184 | | const | block | No | No | Yes (not initialized) | 185 | 186 | Extra reading source 187 | [Var, Let, and Const – What's the Difference?](https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/) 188 | 189 | ## Template String 190 | 191 | Also named, template literal, string interpolation 192 | 193 | ```js 194 | const name = 'mason'; 195 | const age = 104; 196 | // es5 197 | console.log('My name is ' + name + ", and I'm " + age + ' years old'); 198 | 199 | //es6 200 | console.log(`My name is ${name}, and I\'m ${age} years old`); 201 | ``` 202 | 203 | ## Spread operator 204 | 205 | ```js 206 | const array = [1, 2]; 207 | const newArray = [...array, 3, 4]; 208 | console.log(newArray); // [1, 2, 3, 4] 209 | ``` 210 | 211 | ```js 212 | const fruit = { name: 'apple', color: 'green' }; 213 | let newFruit = { ...fruit, color: 'red' }; 214 | console.log(newFruit); // {name: "apple", color: "red"} 215 | newFruit = { color: 'red', ...fruit }; 216 | console.log(newFruit); // {color: "green", name: "apple"} 217 | ``` 218 | 219 | ## Destructuring 220 | 221 | Object destructuring extracts property from object and assigns it to variables. 222 | One way would be using the dot notation 223 | 224 | ```js 225 | const fruit = { name: 'apple', color: 'red' }; 226 | const name = fruit.name; // apple 227 | const color = fruit.color; // red 228 | ``` 229 | 230 | With the new syntax, we don't need to repeatly refer to the `fruit` object 231 | 232 | ```js 233 | const fruit = { name: 'apple', color: 'red' }; 234 | const { name, color } = fruit; 235 | console.log(name); // apple 236 | console.log(color); // red 237 | ``` 238 | 239 | we can also rename the variable 240 | 241 | ```js 242 | const fruit = { name: 'apple', color: 'red' }; 243 | const { name: fruitName, color: fruitColor } = fruit; 244 | console.log(fruitName); // apple 245 | console.log(fruitColor); // red 246 | ``` 247 | 248 | or desctructing an array 249 | 250 | ```js 251 | const fruits = [ 252 | { name: 'apple', color: 'red' }, 253 | { name: 'pear', color: 'green' }, 254 | ]; 255 | const [apple, pear] = fruits; 256 | console.log(apple); // {name: "apple", color: "red"} 257 | console.log(pear); // {name: "pear", color: "green"} 258 | const [{ color: appleColor }, { color: pearColor }] = fruits; 259 | console.log(appleColor); // red 260 | console.log(pearColor); // green 261 | ``` 262 | 263 | more complicated use cases 264 | 265 | ```js 266 | const [foo, [[bar], baz]] = [1, [[2], 3]]; 267 | console.log(foo); // 1 268 | console.log(bar); // 2 269 | console.log(baz); // 3 270 | ``` 271 | 272 | ```js 273 | const [, , third] = ['foo', 'bar', 'baz']; 274 | console.log(third); // "baz" 275 | ``` 276 | 277 | ```js 278 | const [head, ...tail] = [1, 2, 3, 4]; 279 | console.log(head); // 1 280 | console.log(tail); // [2, 3, 4] 281 | // Rest element must be last element 282 | ``` 283 | 284 | ```js 285 | const [missing = true] = []; 286 | console.log(missing); // true 287 | ``` 288 | 289 | ## Default parameters 290 | 291 | ```js 292 | function sum(a = 1, b = 1) { 293 | return a + b; 294 | } 295 | console.log(sum()); // 2 296 | console.log(sum(undefined, 2)); // 3 297 | console.log(sum(3, 4)); // 7 298 | ``` 299 | 300 | ## Arrow function 301 | 302 | ```js 303 | const add = function (x, y) { 304 | return x + y; 305 | }; 306 | // vs 307 | const add = (x, y) => { 308 | return x + y; 309 | }; 310 | // equals 311 | const add = (x, y) => x + y; 312 | ``` 313 | 314 | ### Callback 315 | 316 | Explain in a simple way, pass the function as a parameter and when some _event_ happened (addEventListener), execute this function. 317 | Frequently used for async or sequential purpose 318 | 319 | ```js 320 | function logger(param) { 321 | console.log(param); 322 | } 323 | function sum(x, y, callback) { 324 | setTimeout(function () { 325 | const total = x + y; 326 | callback(total); 327 | }, 1000); 328 | } 329 | sum(1, 2, logger); 330 | ``` 331 | 332 | ### Callback with arrow function 333 | 334 | ```js 335 | setTimeout(function () { 336 | console.log('normal function'); 337 | }, 1000); 338 | 339 | setTimeout(() => { 340 | console.log('arrow function'); 341 | }, 1000); 342 | ``` 343 | 344 | ## Closure 345 | 346 | Closures are everywhere in JS. A closure is when a function has access to its lexical scope even when it is called outside of it. Closures are created every time a function is created, at function creation time. 347 | 348 | A few complex but common closure cases: 349 | 350 | 1. a function was passed to another function as param 351 | 352 | ```js 353 | // we normally don't write this code 354 | const number = 1; 355 | function foo() { 356 | console.log(number); 357 | } 358 | function bar(fn) { 359 | const number = 2; 360 | fn(); 361 | } 362 | bar(foo); // 1 363 | ``` 364 | 365 | 2. a function was returned by another function 366 | 367 | ```js 368 | function foo() { 369 | const number = 1; 370 | return () => { 371 | console.log(number); 372 | }; 373 | } 374 | const number = 100; 375 | foo()(); // 1 376 | ``` 377 | 378 | We can use this technique to hide some data. 379 | 380 | ```js 381 | function createCounter() { 382 | let counter = 0; 383 | const increment = () => { 384 | counter++; 385 | }; 386 | const getCount = () => { 387 | return counter; 388 | }; 389 | return { 390 | increment, 391 | getCount, 392 | }; 393 | } 394 | const counter = createCounter(); 395 | counter.increment(); 396 | console.log(counter.getCount()); 397 | ``` 398 | 399 | ### IIFEs 400 | 401 | Immediately Invoked Function Expressions 402 | Commonly used to avoid polluting the global namespace and modules! 403 | 404 | ```js 405 | (function () { 406 | // some variable in it's own scope 407 | })(); 408 | ``` 409 | 410 | ## this 411 | 412 | In most cases, the value of `this` is determined by how a function is called (runtime binding). It can't be set by assignment during execution, and it may be different each time the function is called. [[MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this)]\* \*[strict mode](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode) is enabled by default in ES6 modules 413 | 414 | ### _this_ keyword in normal functions 415 | 416 | ```js 417 | function foo() { 418 | console.log(this); 419 | } 420 | foo(); // window 421 | ``` 422 | 423 | ### _this_ keyword in normal functions with bind, call, apply 424 | 425 | ```js 426 | // a1,a2 427 | foo.call({ number: 1 }); // {number: 1} 428 | // [a1,a2] 429 | foo.apply({ number: 2 }); // {number: 2} 430 | // bind returns a new function 431 | const bar = foo.bind({ number: 3 }); 432 | bar(); // {number:3} 433 | ``` 434 | 435 | ### _this_ keyword in an object and callback functions 436 | 437 | ```js 438 | const calendar = { 439 | currentDay: 6, 440 | nextDay() { 441 | this.currentDay++; 442 | console.log(this.currentDay); 443 | }, 444 | }; 445 | calendar.nextDay(); 446 | ``` 447 | 448 | ```js 449 | const calendar = { 450 | currentDay: 6, 451 | nextDay() { 452 | setTimeout(function () { 453 | this.currentDay++; 454 | console.log(this.currentDay); 455 | }); // .bind(this) 456 | }, 457 | }; 458 | calendar.nextDay(); 459 | ``` 460 | 461 | In arrow function, `this` points to the enclosing lexical context's `this`. 462 | 463 | ```js 464 | const calendar = { 465 | currentDay: 6, 466 | nextDay() { 467 | setTimeout(() => { 468 | this.currentDay++; 469 | console.log(this.currentDay); 470 | }); 471 | }, 472 | }; 473 | calendar.nextDay(); 474 | ``` 475 | 476 | ```js 477 | const calendar = { 478 | currentDay: 6, 479 | normal: function () { 480 | console.log(1, this); 481 | setTimeout(function () { 482 | console.log(2, this); 483 | }); 484 | }, 485 | arrow: function () { 486 | console.log(3, this); 487 | setTimeout(() => { 488 | console.log(4, this); 489 | }); 490 | }, 491 | }; 492 | calendar.normal(); 493 | calendar.arrow(); 494 | ``` 495 | 496 | ### quiz 497 | 498 | ```js 499 | const object = { 500 | message: 'Hello, World!', 501 | 502 | getMessage() { 503 | const message = 'Hello, Earth!'; 504 | return this.message; 505 | }, 506 | }; 507 | 508 | console.log(object.getMessage()); // ?? 509 | ``` 510 | 511 | ```js 512 | const object = { 513 | who: 'World', 514 | 515 | greet() { 516 | return `Hello, ${this.who}!`; 517 | }, 518 | 519 | farewell: () => { 520 | return `Goodbye, ${this.who}!`; 521 | }, 522 | }; 523 | 524 | console.log(object.greet()); // ?? 525 | console.log(object.farewell()); // ?? 526 | ``` 527 | 528 | ```js 529 | const object = { 530 | who: 'mason', 531 | cb() { 532 | console.log(`Hello, ${this.who}!`); 533 | }, 534 | }; 535 | 536 | function foo(cb) { 537 | cb(); 538 | } 539 | 540 | foo(object.cb); // ?? 541 | object.cb(); // ?? 542 | ``` 543 | 544 | ## Common array operations 545 | 546 | ### Manipulation 547 | 548 | ```js 549 | const fruits = ['apple']; 550 | 551 | fruits.push('pear'); 552 | console.log(fruits); // ["apple", "pear"] 553 | fruits.unshift('grape'); 554 | console.log(fruits); // ["grape", "apple", "pear"] 555 | // splice(x,y,newAdded) 556 | // remove y items from index x, and add newAdded 557 | fruits.splice(1, 1, 'watermelon', 'peach'); 558 | console.log(fruits); // ["grape", "watermelon", "peach", "pear"] 559 | let fruit = fruits.pop(); 560 | console.log(fruit); // pear 561 | console.log(fruits); // ["grape", "watermelon", "peach"] 562 | fruit = fruits.shift(); 563 | console.log(fruit); // grape 564 | console.log(fruits); // ["watermelon", "peach"] 565 | ``` 566 | 567 | ### Iteration 568 | 569 | #### for loop 570 | 571 | ```js 572 | const fruits = ['apple', 'pear']; 573 | for (let index = 0; index < fruits.length; index++) { 574 | const fruit = fruits[index]; 575 | console.log(fruit); 576 | } 577 | // apple 578 | // pear 579 | ``` 580 | 581 | #### for...of 582 | 583 | ```js 584 | const fruits = ['apple', 'pear']; 585 | for (let fruit of fruits) { 586 | console.log(fruit); 587 | } 588 | // apple 589 | // pear 590 | 591 | // for...in -> 0, 1 usually used in object 592 | ``` 593 | 594 | #### forEach 595 | 596 | ```js 597 | const fruits = ['apple', 'pear']; 598 | fruits.forEach((fruit) => console.log(fruit)); 599 | // apple 600 | // pear 601 | // cannot use break here 602 | ``` 603 | 604 | ### Map 605 | 606 | ```js 607 | const fruits = ['apple', 'pear']; 608 | const newFruits = fruits.map((fruit) => ({ 609 | name: fruit, 610 | price: 10, 611 | })); 612 | console.log(newFruits); 613 | // [{name: "apple", price: 10},{name: "pear", price: 10}] 614 | ``` 615 | 616 | ### Reduce 617 | 618 | ```js 619 | const numbers = [1, 2, 3]; 620 | const sum = numbers.reduce((accumulator, number) => accumulator + number, 0); 621 | console.log(sum); // 6 622 | ``` 623 | 624 | ### Search 625 | 626 | ```js 627 | const numbers = [1, 2, 3, 4, 5]; 628 | console.log(numbers.includes(2)); // true 629 | // Array.some 630 | console.log(numbers.indexOf(2)); // 1 631 | // Array.findIndex 632 | ``` 633 | 634 | ```js 635 | const numbers = [1, 2, 3, 4, 5]; 636 | const odds = numbers.filter((i) => i % 2); 637 | console.log(odds); // [1,3,5] 638 | 639 | const fruits = [ 640 | { 641 | name: 'apple', 642 | color: 'red', 643 | }, 644 | { 645 | name: 'pear', 646 | color: 'green', 647 | }, 648 | { 649 | name: 'grape', 650 | color: 'green', 651 | }, 652 | ]; 653 | const filteredFruits = fruits.filter((i) => i.color === 'green'); 654 | console.log(filteredFruits); 655 | // [{name: "pear", color: "green"}, {name: "grape", color: "green"}] 656 | ``` 657 | 658 | ```js 659 | const fruits = [ 660 | { 661 | name: 'apple', 662 | color: 'red', 663 | }, 664 | { 665 | name: 'pear', 666 | color: 'green', 667 | }, 668 | { 669 | name: 'grape', 670 | color: 'green', 671 | }, 672 | ]; 673 | const greenFruit = fruits.find((i) => i.color === 'green'); 674 | console.log(greenFruit); 675 | // {name: "pear", color: "green"} 676 | ``` 677 | 678 | #### Extra reading source 679 | 680 | [link](https://dmitripavlutin.com/operations-on-arrays-javascript/) 681 | 682 | ## Set 683 | 684 | Set is a data structure, we use it to store _unique_ values. 685 | 686 | ```js 687 | const set = new Set([1, 2, 3, 4, 4]); 688 | console.log(set); // Set(4) {1, 2, 3, 4} 689 | set.add(5); 690 | console.log(set); // Set(5) {1, 2, 3, 4, 5} 691 | set.add(1); 692 | console.log(set); // Set(5) {1, 2, 3, 4, 5} 693 | console.log(set.has(5)); // true 694 | set.delete(1); 695 | console.log(set.has(1)); // false 696 | console.log(set.size); // 4 697 | ``` 698 | 699 | ```js 700 | const array = [1, 2, 2, 3, 4, 4]; 701 | const uniqueArray = [...new Set(array)]; 702 | console.log(uniqueArray); // [1, 2, 3, 4] 703 | ``` 704 | 705 | ## Classes 706 | 707 | Classes are a template for creating objects. Classes are in fact functions, class is only a syntax sugar. 708 | 709 | ```js 710 | function Person(name) { 711 | this.name = name; 712 | this.toString = function () { 713 | console.log('name: ' + this.name); 714 | }; 715 | } 716 | var mason = new Person('mason'); 717 | mason.toString(); // name: mason 718 | ``` 719 | 720 | ```js 721 | class Person { 722 | constructor(name) { 723 | this.name = name; 724 | } 725 | toString() { 726 | console.log(`name: ${this.name}`); 727 | } 728 | } 729 | const mason = new Person('mason'); 730 | mason.toString(); // name: mason 731 | ``` 732 | 733 | ### extends 734 | 735 | ```js 736 | class Teacher extends Person { 737 | constructor(name) { 738 | super(name); 739 | } 740 | teach() { 741 | console.log(`${this.name} is teaching`); 742 | } 743 | } 744 | 745 | const mason = new Teacher('mason'); 746 | mason.teach(); // mason is teaching 747 | mason.toString(); // name: mason -> BUT how? 748 | ``` 749 | 750 | ```js 751 | // is mason constructed by Teacher? 752 | mason instanceof Teacher; // true 753 | mason instanceof Person; // true 754 | mason instanceof Object; // true 755 | ``` 756 | 757 | ## quiz 758 | 759 | ```js 760 | function Pet(name) { 761 | this.name = name; 762 | this.getName = () => this.name; 763 | } 764 | 765 | const cat = new Pet('Fluffy'); 766 | 767 | console.log(cat.getName()); // Fluffy 768 | 769 | const { getName } = cat; 770 | console.log(getName()); // Fluffy 771 | ``` 772 | 773 | ```js 774 | var scope = 'global scope'; 775 | function checkscope() { 776 | var scope = 'local scope'; 777 | function f() { 778 | return scope; 779 | } 780 | return f(); 781 | } 782 | checkscope(); // local 783 | ``` 784 | 785 | ```js 786 | var scope = 'global scope'; 787 | function checkscope() { 788 | var scope = 'local scope'; 789 | function f() { 790 | return scope; 791 | } 792 | return f; 793 | } 794 | checkscope()(); // local 795 | ``` 796 | 797 | Quiz questions references 798 | 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