├── .gitignore ├── README.md ├── decorator ├── sale-closures │ ├── index.html │ └── main.js ├── sale │ ├── index.html │ └── main.js └── validator │ ├── index.html │ └── main.js ├── factory ├── abstract-factory │ ├── index.html │ └── main.js ├── factory-method │ ├── index.html │ └── main.js └── simple-factory │ ├── index.html │ └── main.js ├── iterator ├── arrays │ ├── index.html │ └── main.js └── objects │ ├── index.html │ └── main.js ├── observer └── publisher │ ├── index.html │ └── main.js ├── singleton └── namespace │ ├── index.html │ └── main.js └── strategy └── painter ├── index.html ├── jquery.js └── main.js /.gitignore: -------------------------------------------------------------------------------- 1 | strategy/boaz 2 | strategy/mine 3 | patterns.sublime-project 4 | patterns.sublime-workspace 5 | strategy/validator -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # JavaScript Design Patterns 2 | 3 | ## Creational 4 | 5 | - Abstract Factory 6 | - Builder 7 | - Factory Method 8 | - Object Pool 9 | - Prototype 10 | - [Singleton](http://robdodson.me/blog/2012/08/08/javascript-design-patterns-singleton/) 11 | 12 | ## Structural 13 | 14 | - Adapter 15 | - Bridge 16 | - Composite 17 | - [Decorator](http://robdodson.me/blog/2012/08/27/javascript-design-patterns-decorator/) 18 | - Facade 19 | - Flyweight 20 | - Private Class Data 21 | - Proxy 22 | 23 | ## Behavioral 24 | 25 | - Chain of Responsibility 26 | - Command 27 | - Interpreter 28 | - [Iterator](http://robdodson.me/blog/2012/08/10/javascript-design-patterns-iterator/) 29 | - Mediator 30 | - Memento 31 | - Null Object 32 | - [Observer](http://robdodson.me/blog/2012/08/16/javascript-design-patterns-observer/) 33 | - State 34 | - [Strategy](http://robdodson.me/blog/2012/08/03/javascript-design-patterns-strategy/) 35 | - Template Method 36 | - Visitor 37 | - Monad Pattern / Promises 38 | 39 | It occurred to me that I’ve always wanted to go through the Gang of Four book and just write my own interpretation of each pattern. Since I’m currently working primarily in JavaScript I thought it might be an interesting challenge to convert their examples, often in strongly typed languages, to something as dynamic and loosey-goosey as JS. 40 | 41 | I know there are a lot of people out there who aren’t too keen on design patterns but that’s not to say that they shouldn’t be used or studied. There’s a lot of code out there that starts with jQuery.click() or addEventListener or .on() and all of them are implementations of the Observer pattern. Finding this reusable approach is the main point of patterns and along with it comes a shared vocabulary that can be passed on to other developers. Rather than saying “Let’s defer the methods of our object that are subject to change to well encapsulated algorithms.” We can just say “A Strategy pattern might be nice here.” 42 | 43 | Patterns should be used with caution as not everything fits so neatly into their paradigms. It’s often said that a beginner never met a pattern he didn’t like. In my experiences I’ve been burned by pattern overuse and at other times they have legitimately saved my ass. It’s also true that many patterns don’t really work or aren’t appropriate for particular languages. For instance, the GoF book was written primarily for languages which shared features of C++ and SmallTalk. I totally agree with this sentiment but I feel like along the way we’ll discover what does and doesn’t make sense in a dynamic language like JS and hopefully we can toss in some new patterns of our own. Already to the list I’ve added Promises which I use quite frequently and find to be a wonderful alternative to JavaScript’s oft seen pyramid of callbacks. Again, this is all about learning and experimenting. In my opinion a good understanding of design patterns is a threshold that needs to be crossed at some point in your career. I’m committed to doing this twice a week for the next several weeks so hopefully by the end of it we’ll have a useful resource that others can benefit from. Stay tuned! 44 | 45 | [http://robdodson.me/blog/2012/08/03/javascript-design-patterns/](http://robdodson.me/blog/2012/08/03/javascript-design-patterns/) -------------------------------------------------------------------------------- /decorator/sale-closures/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Decorators: With Closures! 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /decorator/sale-closures/main.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | 3 | function Sale(price) { 4 | this.price = price || 100; 5 | } 6 | 7 | Sale.prototype.getPrice = function() { 8 | return this.price; 9 | }; 10 | 11 | Sale.prototype.setPrice = function(price) { 12 | this.price = price; 13 | }; 14 | 15 | function usd(fn, context) { 16 | var price = fn.call(context); 17 | return "$" + price; 18 | } 19 | 20 | function decorate(dec, fn, context) { 21 | return function() { 22 | return dec.call(context, fn, context); 23 | }; 24 | } 25 | 26 | var sale = new Sale(50); 27 | 28 | // Decorate our getPrice method. We'll just add 29 | // some extra dollar signs to the output. 30 | sale.getPrice = decorate(usd, sale.getPrice, sale); 31 | sale.getPrice = decorate(usd, sale.getPrice, sale); 32 | sale.getPrice = decorate(usd, sale.getPrice, sale); 33 | console.log(sale.getPrice()); // output: $$$50 34 | 35 | // Test to make sure other methods can still 36 | // access the price in the correct context 37 | sale.setPrice(100); 38 | console.log(sale.getPrice()); // output: $$$100 -------------------------------------------------------------------------------- /decorator/sale/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Decorators: The Hard Way 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /decorator/sale/main.js: -------------------------------------------------------------------------------- 1 | // Full credit for this example goes to Stoyan Stefanov and his 2 | // amazing book JavaScript Patterns 3 | // http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752 4 | 5 | "use strict"; 6 | 7 | function Sale(price) { 8 | this.price = price || 100; 9 | } 10 | 11 | Sale.prototype.getPrice = function() { 12 | return this.price; 13 | }; 14 | 15 | Sale.decorators = {}; 16 | 17 | Sale.decorators.fedtax = { 18 | getPrice: function() { 19 | var price = this._super.getPrice(); 20 | price += price * 5 / 100; 21 | return price; 22 | } 23 | }; 24 | 25 | Sale.decorators.quebec = { 26 | getPrice: function() { 27 | var price = this._super.getPrice(); 28 | price += price * 7.5 / 100; 29 | return price; 30 | } 31 | }; 32 | 33 | Sale.decorators.money = { 34 | getPrice: function() { 35 | return "$" + this._super.getPrice().toFixed(2); 36 | } 37 | }; 38 | 39 | Sale.decorators.cdn = { 40 | getPrice: function() { 41 | return "CDN$" + this._super.getPrice().toFixed(2); 42 | } 43 | }; 44 | 45 | Sale.prototype.decorate = function (decorator) { 46 | var F = function () {}, 47 | overrides = this.constructor.decorators[decorator], 48 | i, 49 | newobj; 50 | 51 | // Create prototype chain 52 | F.prototype = this; 53 | newobj = new F(); 54 | newobj._super = F.prototype; 55 | 56 | // Mixin properties/methods of our decorator 57 | // Overriding the ones from our prototype 58 | for (i in overrides) { 59 | if (overrides.hasOwnProperty(i)) { 60 | newobj[i] = overrides[i]; 61 | } 62 | } 63 | 64 | return newobj; 65 | }; 66 | 67 | var sale = new Sale(50); 68 | sale = sale.decorate('fedtax'); 69 | sale = sale.decorate('cdn'); 70 | console.log(sale.getPrice()); 71 | -------------------------------------------------------------------------------- /decorator/validator/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Decorators: The Easy Way 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /decorator/validator/main.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | 3 | function Validator () { 4 | this.errors = []; 5 | this.decoratorsList = []; 6 | } 7 | 8 | Validator.prototype.decorate = function(name, args) { 9 | this.decoratorsList.push({ name: name, args: args }); 10 | }; 11 | 12 | Validator.decorators = {}; 13 | 14 | Validator.decorators.hasName = { 15 | validate: function(form, args) { 16 | // Code to verify presence of name... 17 | 18 | this.errors.push('no name!'); 19 | } 20 | }; 21 | 22 | Validator.decorators.hasAge = { 23 | validate: function(form, args) { 24 | // Code to verify presence of age... 25 | 26 | this.errors.push('no age!'); 27 | } 28 | }; 29 | 30 | Validator.decorators.hasZipCode = { 31 | validate: function(form, args) { 32 | // Code to verify presence of zip code... 33 | 34 | this.errors.push('no zip!'); 35 | } 36 | }; 37 | 38 | Validator.prototype.validate = function(form) { 39 | var i, 40 | max, 41 | temp, 42 | name, 43 | args; 44 | 45 | this.form = form; 46 | 47 | max = this.decoratorsList.length; 48 | for (i = 0; i < max; i++) { 49 | temp = this.decoratorsList[i]; 50 | name = temp.name; 51 | args = temp.args; 52 | Validator.decorators[name].validate.call(this, form, args); 53 | } 54 | }; 55 | 56 | // Try it out! 57 | var validator = new Validator(); 58 | validator.decorate('hasName', { length: 5 }); 59 | validator.decorate('hasAge', { minimum: 21 }); 60 | validator.decorate('hasZipCode'); 61 | validator.validate({}); // some form data. in this case just an anonymous object 62 | console.log(validator.errors); 63 | 64 | 65 | 66 | -------------------------------------------------------------------------------- /factory/abstract-factory/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Factory: Abstract Factory 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /factory/abstract-factory/main.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | 3 | // Polyfill -- Only necessary for browsers which don't support Object.create. Check this ES5 compatibility table: 4 | // http://kangax.github.com/es5-compat-table/ 5 | if (!Object.create) { 6 | Object.create = function (o) { 7 | if (arguments.length > 1) { 8 | throw new Error('Object.create implementation only accepts the first parameter.'); 9 | } 10 | function F() {} 11 | F.prototype = o; 12 | return new F(); 13 | }; 14 | } 15 | 16 | 17 | // Credit to Yehuda Katz for `fromPrototype` function 18 | // http://yehudakatz.com/2011/08/12/understanding-prototypes-in-javascript/ 19 | var fromPrototype = function(prototype, object) { 20 | var newObject = Object.create(prototype); 21 | for (var prop in object) { 22 | if (object.hasOwnProperty(prop)) { 23 | newObject[prop] = object[prop]; 24 | } 25 | } 26 | return newObject; 27 | }; 28 | 29 | 30 | // Define our `Ingredients` base object 31 | var Ingredients = { 32 | createDough: function() { 33 | return 'generic dough'; 34 | }, 35 | createSauce: function() { 36 | return 'generic sauce'; 37 | }, 38 | createCrust: function() { 39 | return 'generic crust'; 40 | } 41 | }; 42 | 43 | // Extend `Ingredients` with concrete implementations 44 | Ingredients.createChicagoStyle = function() { 45 | return fromPrototype(Ingredients, { 46 | createDough: function() { 47 | return 'thick, heavy dough'; 48 | }, 49 | createSauce: function() { 50 | return 'rich marinara'; 51 | }, 52 | createCrust: function() { 53 | return 'deep-dish'; 54 | } 55 | }); 56 | }; 57 | 58 | Ingredients.createCaliforniaStyle = function() { 59 | return fromPrototype(Ingredients, { 60 | createDough: function() { 61 | return 'light, fluffy dough'; 62 | }, 63 | createSauce: function() { 64 | return 'tangy red sauce'; 65 | }, 66 | createCrust: function() { 67 | return 'thin and crispy'; 68 | } 69 | }); 70 | }; 71 | 72 | // Try it out! 73 | var californiaIngredients = Ingredients.createCaliforniaStyle(); 74 | console.log(californiaIngredients.createCrust()); // returns 'thin and crispy'; -------------------------------------------------------------------------------- /factory/factory-method/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Factory: Factory Method 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /factory/factory-method/main.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | 3 | // Polyfill -- Only necessary for browsers which don't support Object.create. Check this ES5 compatibility table: 4 | // http://kangax.github.com/es5-compat-table/ 5 | if (!Object.create) { 6 | Object.create = function (o) { 7 | if (arguments.length > 1) { 8 | throw new Error('Object.create implementation only accepts the first parameter.'); 9 | } 10 | function F() {} 11 | F.prototype = o; 12 | return new F(); 13 | }; 14 | } 15 | 16 | 17 | // Credit to Yehuda Katz for `fromPrototype` function 18 | // http://yehudakatz.com/2011/08/12/understanding-prototypes-in-javascript/ 19 | var fromPrototype = function(prototype, object) { 20 | var newObject = Object.create(prototype); 21 | for (var prop in object) { 22 | if (object.hasOwnProperty(prop)) { 23 | newObject[prop] = object[prop]; 24 | } 25 | } 26 | return newObject; 27 | }; 28 | 29 | // Define the Pizza product 30 | var Pizza = { 31 | description: 'Plain Generic Pizza' 32 | }; 33 | 34 | // And the basic PizzaStore 35 | var PizzaStore = { 36 | createPizza: function(type) { 37 | if (type == 'cheese') { 38 | return fromPrototype(Pizza, { 39 | description: 'Cheesy, Generic Pizza' 40 | }); 41 | } else if (type == 'veggie') { 42 | return fromPrototype(Pizza, { 43 | description: 'Veggie, Generic Pizza' 44 | }); 45 | } 46 | } 47 | }; 48 | 49 | var ChicagoPizzaStore = fromPrototype(PizzaStore, { 50 | createPizza: function(type) { 51 | if (type == 'cheese') { 52 | return fromPrototype(Pizza, { 53 | description: 'Cheesy, Deep-dish Chicago Pizza' 54 | }); 55 | } else if (type == 'veggie') { 56 | return fromPrototype(Pizza, { 57 | description: 'Veggie, Deep-dish Chicago Pizza' 58 | }); 59 | } 60 | } 61 | }); 62 | 63 | var CaliforniaPizzaStore = fromPrototype(PizzaStore, { 64 | createPizza: function(type) { 65 | if (type == 'cheese') { 66 | return fromPrototype(Pizza, { 67 | description: 'Cheesy, Tasty California Pizza' 68 | }); 69 | } else if (type == 'veggie') { 70 | return fromPrototype(Pizza, { 71 | description: 'Veggie, Tasty California Pizza' 72 | }); 73 | } 74 | } 75 | }); 76 | 77 | // Elsewhere in our app... 78 | var chicagoStore = Object.create(ChicagoPizzaStore); 79 | var pizza = chicagoStore.createPizza('veggie'); 80 | console.log(pizza.description); // returns 'Veggie, Deep-dish Chicago Pizza' -------------------------------------------------------------------------------- /factory/simple-factory/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Factory: Simple Factory 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /factory/simple-factory/main.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | 3 | function Admin() { 4 | console.log('Admin created!'); 5 | } 6 | 7 | function Customer() { 8 | console.log('Customer created!'); 9 | } 10 | 11 | var UserFactory = {}; 12 | UserFactory.createUser = function(type) { 13 | if (type == 'admin') { 14 | return new Admin(); 15 | } else if (type == 'customer') { 16 | return new Customer(); 17 | } 18 | }; 19 | 20 | var customer = UserFactory.createUser('admin'); 21 | var customer = UserFactory.createUser('customer'); -------------------------------------------------------------------------------- /iterator/arrays/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Iterator: Arrays 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /iterator/arrays/main.js: -------------------------------------------------------------------------------- 1 | // Examples inspired by Stoyan Stefanov and his 2 | // amazing book JavaScript Patterns 3 | // http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752 4 | 5 | "use strict"; 6 | 7 | var iterator = (function() { 8 | 9 | var index = 0, 10 | data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 11 | length = data.length; 12 | 13 | return { 14 | next: function() { 15 | var element; 16 | if (!this.hasNext()) { 17 | return null; 18 | } 19 | element = data[index]; 20 | index += 3; 21 | return element; 22 | }, 23 | hasNext: function() { 24 | return index < length; 25 | }, 26 | rewind: function() { 27 | index = 0; 28 | return data[index]; 29 | }, 30 | current: function() { 31 | return data[index]; 32 | } 33 | }; 34 | 35 | }()); -------------------------------------------------------------------------------- /iterator/objects/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Iterator: Objects 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /iterator/objects/main.js: -------------------------------------------------------------------------------- 1 | // Examples inspired by Stoyan Stefanov and his 2 | // amazing book JavaScript Patterns 3 | // http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752 4 | 5 | "use strict"; 6 | 7 | var iterator = (function() { 8 | var data = { foo: 'foo', bar: 'bar', baz: 'baz' }, 9 | keys = Object.keys(data), 10 | index = 0, 11 | length = keys.length; 12 | 13 | return { 14 | next: function() { 15 | var element; 16 | if (!this.hasNext()) { 17 | return null; 18 | } 19 | element = data[keys[index]]; 20 | index++; 21 | return element; 22 | }, 23 | hasNext: function() { 24 | return index < length; 25 | }, 26 | rewind: function() { 27 | index = 0; 28 | return data[keys[index]]; 29 | }, 30 | current: function() { 31 | return data[keys[index]]; 32 | } 33 | }; 34 | 35 | }()); -------------------------------------------------------------------------------- /observer/publisher/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Observer: Publisher 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /observer/publisher/main.js: -------------------------------------------------------------------------------- 1 | // Full credit for this example goes to Stoyan Stefanov and his 2 | // amazing book JavaScript Patterns 3 | // http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752 4 | 5 | "use strict"; 6 | 7 | var publisher = { 8 | subscribers: { 9 | any: [] // event type: subscribers 10 | }, 11 | on: function(type, fn, context) { 12 | type = type || 'any'; 13 | fn = typeof fn === 'function' ? fn : context[fn]; 14 | if (typeof this.subscribers[type] === "undefined") { 15 | this.subscribers[type] = []; 16 | } 17 | this.subscribers[type].push({ fn: fn, context: context || this }); 18 | }, 19 | remove: function(type, fn, context) { 20 | this.visitSubscribers('unsubscribe', type, fn, context); 21 | }, 22 | fire: function(type, publication) { 23 | this.visitSubscribers('publish', type, publication); 24 | }, 25 | visitSubscribers: function(action, type, arg, context) { 26 | var pubtype = type || 'any', 27 | subscribers = this.subscribers[pubtype], 28 | i, 29 | max = subscribers ? subscribers.length : 0; 30 | 31 | for (i = 0; i < max; i += 1) { 32 | if (action === 'publish') { 33 | // Call our observers, passing along arguments 34 |  subscribers[i].fn.call(subscribers[i].context, arg); 35 | } else { 36 | if (subscribers[i].fn === arg && subscribers[i].context === context) { 37 | subscribers.splice(i, 1); 38 | } 39 | } 40 | } 41 | } 42 | }; -------------------------------------------------------------------------------- /singleton/namespace/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Singleton: Namespace 6 | 7 | 8 | 9 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /singleton/namespace/main.js: -------------------------------------------------------------------------------- 1 | var NAMESPACE = {}; 2 | 3 | NAMESPACE.Widget = function(foo, bar) { 4 | // Some awesome widget code 5 | }; 6 | 7 | NAMESPACE.Widget.prototype.doSomethingAwesome = function() { 8 | // do something awesome!!! 9 | }; 10 | 11 | var myWidget = new NAMESPACE.Widget('hello', 'world'); -------------------------------------------------------------------------------- /strategy/painter/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Strategy: Painter 6 | 7 | 8 | 16 | 17 | 18 | 19 |
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a=this[0];return a?a.style?parseFloat(f.css(a,c,"padding")):this[c]():null},f.fn["outer"+a]=function(a){var b=this[0];return b?b.style?parseFloat(f.css(b,c,a?"margin":"border")):this[c]():null},f.fn[c]=function(a){return f.access(this,function(a,c,h){var i,j,k,l;if(f.isWindow(a)){i=a.document,j=i.documentElement[d];return f.support.boxModel&&j||i.body&&i.body[d]||j}if(a.nodeType===9){i=a.documentElement;if(i[d]>=i[e])return i[d];return Math.max(a.body[e],i[e],a.body[g],i[g])}if(h===b){k=f.css(a,c),l=parseFloat(k);return f.isNumeric(l)?l:k}f(a).css(c,h)},c,a,arguments.length,null)}}),a.jQuery=a.$=f,typeof define=="function"&&define.amd&&define.amd.jQuery&&define("jquery",[],function(){return f})})(window); -------------------------------------------------------------------------------- /strategy/painter/main.js: -------------------------------------------------------------------------------- 1 | $(function() { 2 | var $canvas, context, 3 | offset, offsetLeft, offsetTop, 4 | isDrawing, 5 | brush, brushes; 6 | 7 | $canvas = $('#painter'); 8 | context = $canvas[0].getContext('2d'); 9 | 10 | // Find the canvas offset so we can get accurate 11 | // mouse positions for our shapes 12 | offset = $canvas.offset(); 13 | offsetLeft = offset.left; 14 | offsetTop = offset.top; 15 | 16 | // Set the initial state 17 | isDrawing = false; 18 | 19 | // Define our brush strategy objects 20 | brushes = { 21 | outline: { 22 | draw: function(e, context) { 23 | context.strokeRect(e.pageX - offsetLeft, e.pageY - offsetTop, 10, 10); 24 | } 25 | }, 26 | square: { 27 | draw: function(e, context) { 28 | context.fillRect(e.pageX - offsetLeft, e.pageY - offsetTop, 10, 10); 29 | } 30 | }, 31 | circle: { 32 | draw: function(e, context) { 33 | context.arc(e.pageX - offsetLeft, e.pageY - offsetTop, 10, 0, Math.PI * 2); 34 | context.fill(); 35 | } 36 | } 37 | }; 38 | brush = brushes.circle; 39 | 40 | // Listen for mouse events on the canvas 41 | $canvas 42 | .on('mousedown', function() { 43 | isDrawing = true; 44 | }) 45 | .on('mouseup mouseleave', function() { 46 | isDrawing = false; 47 | }) 48 | .on('mousemove', function(e) { 49 | if (isDrawing) { 50 | // Defer drawing to a strategy object 51 | brush.draw(e, context); 52 | } 53 | }); 54 | 55 | // Listen for when the user changes the selected brush 56 | $('#btns button').on('click', function(e) { 57 | // Grab the button's `data-brush` attribute 58 | // and set that as our brush strategy 59 | var brushType = $(this).data('brush'); 60 | brush = brushes[brushType]; 61 | }); 62 | }); 63 | --------------------------------------------------------------------------------