├── .gitattributes ├── 1 Object ├── Explain └── Practice.js ├── 2 Class-Object ├── Explain.text └── Practice.js ├── 3 Class-Constructor ├── Explain.text ├── Practice1.js └── Practice2.js ├── 4 Static-Keyword ├── Explain.text └── Practice1.js ├── 5 Inheritance ├── Explain.text └── Practice1.js ├── 6 Overriding ├── Explain.text └── Practice1.js ├── 7 Method-Overloading └── Explain.text ├── 8 Polymorphism └── Explain.text ├── 9 Abstraction └── Explain.text ├── LICENSE ├── README.md └── package.json /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | -------------------------------------------------------------------------------- /1 Object/Explain: -------------------------------------------------------------------------------- 1 | Object: 2 | An Object is a unique entity that contains properties like. 3 | a) variable type properties 4 | b) methods 5 | c) object 6 | d) array 7 | e) and more.... 8 | 9 | -------------------------------------------------------------------------------- /1 Object/Practice.js: -------------------------------------------------------------------------------- 1 | //Object Literal 2 | let person = { 3 | 4 | //Properties 5 | first_name: 'Jhon', 6 | last_name: 'Dee', 7 | 8 | //method 9 | getName:()=> { 10 | return (`The name of the person is ${person.first_name} ${person.last_name}`) 11 | } 12 | 13 | } 14 | 15 | console.log(person.getName()); 16 | -------------------------------------------------------------------------------- /2 Class-Object/Explain.text: -------------------------------------------------------------------------------- 1 | Classes are blueprints of an Object 2 | a) A class can have many Objects because 3 | b) Class is a template while Objects are instances of the class 4 | c) Using let or var to declare variables inside a class is unnecessary because class 5 | properties are automatically scoped to the class instance and don't require explicit 6 | variable declarations. 7 | -------------------------------------------------------------------------------- /2 Class-Object/Practice.js: -------------------------------------------------------------------------------- 1 | class Person { 2 | 3 | //Properties 4 | first_name='Jhon' 5 | last_name='Dee' 6 | 7 | //method 8 | getName() { 9 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 10 | } 11 | } 12 | 13 | const person1 = new Person(); 14 | console.log(person1.getName()); 15 | -------------------------------------------------------------------------------- /3 Class-Constructor/Explain.text: -------------------------------------------------------------------------------- 1 | Classes constructor is a magic method 2 | a) Constructor execute automatically when object is created 3 | b) Constructor can take parameter 4 | c) Constructor method can't return any result 5 | -------------------------------------------------------------------------------- /3 Class-Constructor/Practice1.js: -------------------------------------------------------------------------------- 1 | class Person { 2 | constructor() { 3 | console.log('I am a constructor') 4 | } 5 | } 6 | const person1 = new Person(); 7 | -------------------------------------------------------------------------------- /3 Class-Constructor/Practice2.js: -------------------------------------------------------------------------------- 1 | class Person { 2 | constructor(msg) { 3 | console.log(msg) 4 | } 5 | } 6 | const person1 = new Person('I am a constructor'); 7 | -------------------------------------------------------------------------------- /4 Static-Keyword/Explain.text: -------------------------------------------------------------------------------- 1 | Static Keyword 2 | a) The static keyword is used to define a static method or property of a class. 3 | b) To call the static method we do not need to create an instance or object of the class. 4 | c) We create a static variable in JavaScript to prevent replication 5 | d) Fixed configuration, and it is also useful for caches 6 | -------------------------------------------------------------------------------- /4 Static-Keyword/Practice1.js: -------------------------------------------------------------------------------- 1 | class Person { 2 | 3 | //Properties 4 | static first_name='Jhon' 5 | static last_name='Dee' 6 | 7 | //method 8 | static getName() { 9 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 10 | } 11 | 12 | } 13 | 14 | console.log(Person.getName()); 15 | 16 | -------------------------------------------------------------------------------- /5 Inheritance/Explain.text: -------------------------------------------------------------------------------- 1 | Inheritance 2 | a) Keyword "extends" is used to create inherit relationship between class 3 | b) For inherit relationship child class can use parent class properties -------------------------------------------------------------------------------- /5 Inheritance/Practice1.js: -------------------------------------------------------------------------------- 1 | class Father { 2 | 3 | //Properties 4 | first_name='Jhon' 5 | last_name='Dee' 6 | //method 7 | getName() { 8 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 9 | } 10 | 11 | } 12 | 13 | class Son extends Father{ 14 | 15 | } 16 | 17 | const SonObj = new Son(); 18 | console.log(SonObj.getName()); 19 | 20 | -------------------------------------------------------------------------------- /6 Overriding/Explain.text: -------------------------------------------------------------------------------- 1 | Property Overriding 2 | a) Overriding works for inheritance relationship 3 | b) When child class change his parent properties , that is overriding -------------------------------------------------------------------------------- /6 Overriding/Practice1.js: -------------------------------------------------------------------------------- 1 | class Father { 2 | 3 | //Properties 4 | first_name='Jhon' 5 | last_name='Dee' 6 | 7 | //method 8 | getName() { 9 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 10 | } 11 | 12 | } 13 | 14 | class Son extends Father{ 15 | // Overriding Occurs 16 | first_name='Jhon Junior' 17 | } 18 | 19 | const SonObj = new Son(); 20 | console.log(SonObj.getName()); 21 | 22 | -------------------------------------------------------------------------------- /7 Method-Overloading/Explain.text: -------------------------------------------------------------------------------- 1 | Method Overloading 2 | a) Method overloading allows you to define multiple methods 3 | with the same name but different parameter lists 4 | 5 | getName(a) { 6 | } 7 | getName(a,b) { 8 | } 9 | 10 | b) JavaScript does not natively support method overloading -------------------------------------------------------------------------------- /8 Polymorphism/Explain.text: -------------------------------------------------------------------------------- 1 | Polymorphism 2 | a) The polymorphism is a core concept of an object-oriented paradigm 3 | that provides a way to perform a single action in different forms. 4 | 5 | a) We already know about Inheritance,Overriding,Overloading - those concepts together represent 6 | polymorphism 7 | 8 | -------------------------------------------------------------------------------- /9 Abstraction/Explain.text: -------------------------------------------------------------------------------- 1 | Abstraction 2 | a) Keyword "abstract" use for class abstraction 3 | b) You can't create object for abstract class 4 | c) Abstract class Always needs its inherited child class to perform 5 | d) JavaScript does not have built-in support for abstract 6 | 7 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. For the purposes of this definition, 18 | "control" means (i) the power, direct or indirect, to cause the 19 | direction or management of such entity, whether by contract or 20 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 21 | outstanding shares, or (iii) beneficial ownership of such entity. 22 | 23 | "You" (or "Your") shall mean an individual or Legal Entity 24 | exercising permissions granted by this License. 25 | 26 | "Source" form shall mean the preferred form for making modifications, 27 | including but not limited to software source code, documentation 28 | source, and configuration files. 29 | 30 | "Object" form shall mean any form resulting from mechanical 31 | transformation or translation of a Source form, including but 32 | not limited to compiled object code, generated documentation, 33 | and conversions to other media types. 34 | 35 | "Work" shall mean the work of authorship, whether in Source or 36 | Object form, made available under the License, as indicated by a 37 | copyright notice that is included in or attached to the work 38 | (an example is provided in the Appendix below). 39 | 40 | "Derivative Works" shall mean any work, whether in Source or Object 41 | form, that is based on (or derived from) the Work and for which the 42 | editorial revisions, annotations, elaborations, or other modifications 43 | represent, as a whole, an original work of authorship. For the purposes 44 | of this License, Derivative Works shall not include works that remain 45 | separable from, or merely link (or bind by name) to the interfaces of, 46 | the Work and Derivative Works thereof. 47 | 48 | "Contribution" shall mean any work of authorship, including 49 | the original version of the Work and any modifications or additions 50 | to that Work or Derivative Works thereof, that is intentionally 51 | submitted to Licensor for inclusion in the Work by the copyright owner 52 | or by an individual or Legal Entity authorized to submit on behalf of 53 | the copyright owner. For the purposes of this definition, "submitted" 54 | means any form of electronic, verbal, or written communication sent 55 | to the Licensor or its representatives, including but not limited to 56 | communication on electronic mailing lists, source code control systems, 57 | and issue tracking systems that are managed by, or on behalf of, the 58 | Licensor for the purpose of discussing and improving the Work, but 59 | excluding communication that is conspicuously marked or otherwise 60 | designated in writing by the copyright owner as "Not a Contribution." 61 | 62 | "Contributor" shall mean Licensor and any individual or Legal Entity 63 | on behalf of whom a Contribution has been received by Licensor and 64 | subsequently incorporated within the Work. 65 | 66 | 2. Grant of Copyright License. Subject to the terms and conditions of 67 | this License, each Contributor hereby grants to You a perpetual, 68 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 69 | copyright license to reproduce, prepare Derivative Works of, 70 | publicly display, publicly perform, sublicense, and distribute the 71 | Work and such Derivative Works in Source or Object form. 72 | 73 | 3. Grant of Patent License. Subject to the terms and conditions of 74 | this License, each Contributor hereby grants to You a perpetual, 75 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 76 | (except as stated in this section) patent license to make, have made, 77 | use, offer to sell, sell, import, and otherwise transfer the Work, 78 | where such license applies only to those patent claims licensable 79 | by such Contributor that are necessarily infringed by their 80 | Contribution(s) alone or by combination of their Contribution(s) 81 | with the Work to which such Contribution(s) was submitted. If You 82 | institute patent litigation against any entity (including a 83 | cross-claim or counterclaim in a lawsuit) alleging that the Work 84 | or a Contribution incorporated within the Work constitutes direct 85 | or contributory patent infringement, then any patent licenses 86 | granted to You under this License for that Work shall terminate 87 | as of the date such litigation is filed. 88 | 89 | 4. Redistribution. You may reproduce and distribute copies of the 90 | Work or Derivative Works thereof in any medium, with or without 91 | modifications, and in Source or Object form, provided that You 92 | meet the following conditions: 93 | 94 | (a) You must give any other recipients of the Work or 95 | Derivative Works a copy of this License; and 96 | 97 | (b) You must cause any modified files to carry prominent notices 98 | stating that You changed the files; and 99 | 100 | (c) You must retain, in the Source form of any Derivative Works 101 | that You distribute, all copyright, patent, trademark, and 102 | attribution notices from the Source form of the Work, 103 | excluding those notices that do not pertain to any part of 104 | the Derivative Works; and 105 | 106 | (d) If the Work includes a "NOTICE" text file as part of its 107 | distribution, then any Derivative Works that You distribute must 108 | include a readable copy of the attribution notices contained 109 | within such NOTICE file, excluding those notices that do not 110 | pertain to any part of the Derivative Works, in at least one 111 | of the following places: within a NOTICE text file distributed 112 | as part of the Derivative Works; within the Source form or 113 | documentation, if provided along with the Derivative Works; or, 114 | within a display generated by the Derivative Works, if and 115 | wherever such third-party notices normally appear. The contents 116 | of the NOTICE file are for informational purposes only and 117 | do not modify the License. You may add Your own attribution 118 | notices within Derivative Works that You distribute, alongside 119 | or as an addendum to the NOTICE text from the Work, provided 120 | that such additional attribution notices cannot be construed 121 | as modifying the License. 122 | 123 | You may add Your own copyright statement to Your modifications and 124 | may provide additional or different license terms and conditions 125 | for use, reproduction, or distribution of Your modifications, or 126 | for any such Derivative Works as a whole, provided Your use, 127 | reproduction, and distribution of the Work otherwise complies with 128 | the conditions stated in this License. 129 | 130 | 5. Submission of Contributions. Unless You explicitly state otherwise, 131 | any Contribution intentionally submitted for inclusion in the Work 132 | by You to the Licensor shall be under the terms and conditions of 133 | this License, without any additional terms or conditions. 134 | Notwithstanding the above, nothing herein shall supersede or modify 135 | the terms of any separate license agreement you may have executed 136 | with Licensor regarding such Contributions. 137 | 138 | 6. Trademarks. This License does not grant permission to use the trade 139 | names, trademarks, service marks, or product names of the Licensor, 140 | except as required for reasonable and customary use in describing the 141 | origin of the Work and reproducing the content of the NOTICE file. 142 | 143 | 7. Disclaimer of Warranty. Unless required by applicable law or 144 | agreed to in writing, Licensor provides the Work (and each 145 | Contributor provides its Contributions) on an "AS IS" BASIS, 146 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 147 | implied, including, without limitation, any warranties or conditions 148 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 149 | PARTICULAR PURPOSE. You are solely responsible for determining the 150 | appropriateness of using or redistributing the Work and assume any 151 | risks associated with Your exercise of permissions under this License. 152 | 153 | 8. Limitation of Liability. In no event and under no legal theory, 154 | whether in tort (including negligence), contract, or otherwise, 155 | unless required by applicable law (such as deliberate and grossly 156 | negligent acts) or agreed to in writing, shall any Contributor be 157 | liable to You for damages, including any direct, indirect, special, 158 | incidental, or consequential damages of any character arising as a 159 | result of this License or out of the use or inability to use the 160 | Work (including but not limited to damages for loss of goodwill, 161 | work stoppage, computer failure or malfunction, or any and all 162 | other commercial damages or losses), even if such Contributor 163 | has been advised of the possibility of such damages. 164 | 165 | 9. Accepting Warranty or Additional Liability. While redistributing 166 | the Work or Derivative Works thereof, You may choose to offer, 167 | and charge a fee for, acceptance of support, warranty, indemnity, 168 | or other liability obligations and/or rights consistent with this 169 | License. However, in accepting such obligations, You may act only 170 | on Your own behalf and on Your sole responsibility, not on behalf 171 | of any other Contributor, and only if You agree to indemnify, 172 | defend, and hold each Contributor harmless for any liability 173 | incurred by, or claims asserted against, such Contributor by reason 174 | of your accepting any such warranty or additional liability. 175 | 176 | END OF TERMS AND CONDITIONS 177 | 178 | APPENDIX: How to apply the Apache License to your work. 179 | 180 | To apply the Apache License to your work, attach the following 181 | boilerplate notice, with the fields enclosed by brackets "[]" 182 | replaced with your own identifying information. (Don't include 183 | the brackets!) The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # JavaScript Object Oriented Programming Complete Note 2 | 3 | #### 1. JavaScript Object 4 | An Object is a unique entity that contains properties like. 5 | - Variable type properties 6 | - Methods properties 7 | - Object properties 8 | - Array properties 9 | - And more.... 10 | 11 | ```sh 12 | let person = { 13 | //Properties 14 | first_name: 'Jhon', 15 | last_name: 'Dee', 16 | //method 17 | getName:()=> { 18 | return (`The name of the person is ${person.first_name} ${person.last_name}`) 19 | } 20 | } 21 | console.log(person.getName()); 22 | ``` 23 | 24 | #### 2. Class & Object 25 | Classes are blueprints of an Object 26 | - A class can have many Objects because 27 | - Class is a template while Objects are instances of the class 28 | - Using let or var to declare variables inside a class is unnecessary because class 29 | properties are automatically scoped to the class instance and don't require explicit 30 | variable declarations 31 | 32 | ```sh 33 | class Person { 34 | //Properties 35 | first_name='Jhon' 36 | last_name='Dee' 37 | 38 | //method 39 | getName() { 40 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 41 | } 42 | } 43 | const person1 = new Person(); 44 | console.log(person1.getName()); 45 | ``` 46 | 47 | #### 3. Constructor 48 | Class constructor is a magic method 49 | - Constructor execute automatically when object is created 50 | - Constructor can take parameter 51 | - Constructor method can't return any result 52 | 53 | ```sh 54 | class Person { 55 | constructor() { 56 | console.log('I am a constructor') 57 | } 58 | } 59 | const person1 = new Person(); 60 | ``` 61 | ```sh 62 | class Person { 63 | constructor(msg) { 64 | console.log(msg) 65 | } 66 | } 67 | const person1 = new Person('I am a constructor'); 68 | ``` 69 | 70 | 71 | #### 4. Static Keyword 72 | Class constructor is a magic method 73 | - The static keyword is used to define a static method or property of a class. 74 | - To call the static method we do not need to create an instance or object of the class. 75 | - We create a static variable in JavaScript to prevent replication 76 | - Fixed configuration, and it is also useful for caches 77 | 78 | ```sh 79 | class Person { 80 | //Properties 81 | static first_name='Jhon' 82 | static last_name='Dee' 83 | //method 84 | static getName() { 85 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 86 | } 87 | } 88 | console.log(Person.getName()); 89 | ``` 90 | 91 | 92 | #### 5. Inheritance 93 | - Keyword "extends" is used to create inherit relationship between class 94 | - For inherit relationship child class can use parent class properties 95 | ```sh 96 | class Father { 97 | //Properties 98 | first_name='Jhon' 99 | last_name='Dee' 100 | //method 101 | getName() { 102 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 103 | } 104 | } 105 | 106 | class Son extends Father{ 107 | 108 | } 109 | 110 | const SonObj = new Son(); 111 | console.log(SonObj.getName()); 112 | 113 | ``` 114 | 115 | 116 | #### 6. Overriding 117 | - Overriding works for inheritance relationship 118 | - When child class change his parent properties , that is overriding 119 | ```sh 120 | class Father { 121 | //Properties 122 | first_name='Jhon' 123 | last_name='Dee' 124 | 125 | //method 126 | getName() { 127 | return (`The name of the person is ${this.first_name} ${this.last_name}`) 128 | } 129 | } 130 | 131 | class Son extends Father{ 132 | // Overriding Occurs 133 | first_name='Jhon Junior' 134 | } 135 | const SonObj = new Son(); 136 | console.log(SonObj.getName()); 137 | ``` 138 | 139 | 140 | #### 7. Method Overloading 141 | - Method overloading allows you to define multiple methods with the same name but different parameter lists 142 | - JavaScript does not natively support method overloading 143 | 144 | 145 | #### 8. Polymorphism 146 | - The polymorphism is a core concept of an object-oriented paradigm 147 | that provides a way to perform a single action in different forms. 148 | - We already know about Inheritance,Overriding,Overloading - those concepts together represent 149 | polymorphism 150 | 151 | #### 9. Abstraction 152 | - Keyword "abstract" use for class abstraction 153 | - You can't create object for abstract class 154 | - Abstract class Always needs its inherited child class to perform 155 | - JavaScript does not have built-in support for abstract 156 | 157 | #### Thank You 158 | 159 | 160 | 161 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "JS-OOP", 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 | } 13 | --------------------------------------------------------------------------------