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Lars KappertLars Kappert
Lars Kappert
authored and
Lars Kappert
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Proper indentation using tabs (both HTML and JS)
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‎code-reuse-patterns/borrowing-methods.html

Lines changed: 79 additions & 79 deletions
Original file line numberDiff line numberDiff line change
@@ -1,82 +1,82 @@
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<!doctype html>
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<html lang="en">
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<head>
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<title>JavaScript Patterns</title>
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<meta charset="utf-8">
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</head>
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<body>
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<script>
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/* Title: Borrowing Methods
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Description: reuse one or two methods of an existing object without forming a parent-child relationship with that object
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*/
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function f() {
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var args = [].slice.call(arguments, 1, 3);
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return args;
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}
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var one = {
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name: 'object',
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say: function (greet) {
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return greet + ', ' + this.name;
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}
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};
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// test
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console.log(one.say('hi')); // "hi, object"
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var two = {
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name: 'another object'
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};
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console.log(one.say.apply(two, ['hello'])); // "hello, another object"
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// assigning to a variable
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// `this` will point to the global object
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var say = one.say;
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console.log(say('hoho')); // "hoho, undefined"
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// passing as a callback
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var yetanother = {
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name: 'Yet another object',
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method: function (callback) {
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return callback('Hola');
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}
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};
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console.log(yetanother.method(one.say)); // "Holla, undefined"
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function bind(o, m) {
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return function () {
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return m.apply(o, [].slice.call(arguments));
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};
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}
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var twosay = bind(two, one.say);
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console.log(twosay('yo')); // "yo, another object"
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// ECMAScript 5 adds a method bind() to Function.prototype, making it just as easy to use as apply() and call().
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if (typeof Function.prototype.bind === 'undefined') {
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Function.prototype.bind = function (thisArg) {
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var fn = this,
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slice = Array.prototype.slice,
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args = slice.call(arguments, 1);
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return function () {
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return fn.apply(thisArg, args.concat(slice.call(arguments)));
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};
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};
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}
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var twosay2 = one.say.bind(two);
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console.log(twosay2('Bonjour')); // "Bonjour, another object"
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var twosay3 = one.say.bind(two, 'Enchanté');
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console.log(twosay3()); // "Enchanté, another object"
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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<head>
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<title>JavaScript Patterns</title>
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<meta charset="utf-8">
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</head>
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<body>
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<script>
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/* Title: Borrowing Methods
10+
Description: reuse one or two methods of an existing object without forming a parent-child relationship with that object
11+
*/
12+
13+
function f() {
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var args = [].slice.call(arguments, 1, 3);
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return args;
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}
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var one = {
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name:'object',
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say:function (greet) {
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return greet + ', ' + this.name;
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}
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};
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// test
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console.log(one.say('hi')); // "hi, object"
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var two = {
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name:'another object'
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};
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console.log(one.say.apply(two, ['hello'])); // "hello, another object"
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// assigning to a variable
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// `this` will point to the global object
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var say = one.say;
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console.log(say('hoho')); // "hoho, undefined"
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// passing as a callback
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var yetanother = {
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name:'Yet another object',
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method:function (callback) {
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return callback('Hola');
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}
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};
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console.log(yetanother.method(one.say)); // "Holla, undefined"
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function bind(o, m) {
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return function () {
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return m.apply(o, [].slice.call(arguments));
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};
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}
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var twosay = bind(two, one.say);
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console.log(twosay('yo')); // "yo, another object"
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// ECMAScript 5 adds a method bind() to Function.prototype, making it just as easy to use as apply() and call().
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if (typeof Function.prototype.bind === 'undefined') {
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Function.prototype.bind = function (thisArg) {
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var fn = this,
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slice = Array.prototype.slice,
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args = slice.call(arguments, 1);
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return function () {
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return fn.apply(thisArg, args.concat(slice.call(arguments)));
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};
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};
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}
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var twosay2 = one.say.bind(two);
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console.log(twosay2('Bonjour')); // "Bonjour, another object"
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var twosay3 = one.say.bind(two, 'Enchanté');
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console.log(twosay3()); // "Enchanté, another object"
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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</html>

‎code-reuse-patterns/cp1-default.html

Lines changed: 47 additions & 46 deletions
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<!doctype html>
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<html lang="en">
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<head>
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<title>JavaScript Patterns</title>
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<meta charset="utf-8">
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</head>
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<body>
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<script>
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/* Title: Classical Pattern #1 - The Default Pattern (a pattern that should be generally avoided)
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Description: create an object using the Parent() constructor and assign this object to the Child()'s prototype
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*/
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function inherit(C, P) {
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C.prototype = new P();
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}
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// the parent constructor
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function Parent(name) {
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this.name = name || 'Adam';
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}
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// adding functionality to the prototype
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Parent.prototype.say = function () {
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return this.name;
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};
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// empty child constructor
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function Child(name) {}
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// inheritance magic happens here
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inherit(Child, Parent);
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var kid = new Child();
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console.log(kid.say()); // "Adam"
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// Drawback 1: own properties added to `this` is inherited
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var kiddo = new Child();
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kiddo.name = "Patrick";
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console.log(kiddo.say()); // "Patrick"
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// Drawback 2: it doesn't enable you to pass parameters to the child constructor
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var s = new Child('Seth');
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console.log(s.say()); // "Adam"
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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<head>
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<title>JavaScript Patterns</title>
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<meta charset="utf-8">
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</head>
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<body>
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<script>
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/* Title: Classical Pattern #1 - The Default Pattern (a pattern that should be generally avoided)
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Description: create an object using the Parent() constructor and assign this object to the Child()'s prototype
11+
*/
12+
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function inherit(C, P) {
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C.prototype = new P();
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}
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// the parent constructor
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function Parent(name) {
19+
this.name = name || 'Adam';
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}
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// adding functionality to the prototype
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Parent.prototype.say = function () {
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return this.name;
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};
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// empty child constructor
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function Child(name) {
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}
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// inheritance magic happens here
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inherit(Child, Parent);
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var kid = new Child();
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console.log(kid.say()); // "Adam"
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// Drawback 1: own properties added to `this` is inherited
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var kiddo = new Child();
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kiddo.name = "Patrick";
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console.log(kiddo.say()); // "Patrick"
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// Drawback 2: it doesn't enable you to pass parameters to the child constructor
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var s = new Child('Seth');
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console.log(s.say()); // "Adam"
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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</html>

‎code-reuse-patterns/cp2-rent-a-constructor.html

Lines changed: 57 additions & 57 deletions
Original file line numberDiff line numberDiff line change
@@ -1,60 +1,60 @@
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<!doctype html>
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<html lang="en">
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<head>
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<title>JavaScript Patterns</title>
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<meta charset="utf-8">
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</head>
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<body>
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<script>
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/* Title: Classical Pattern #2 - Rent a Constructor (a pattern that should be generally avoided)
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Description: it borrows the parent constructor, passing the child object to be bound to this and also forwarding any arguments
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*/
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// the parent constructor
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function Parent(name) {
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this.name = name || 'Adam';
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}
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// adding functionality to the prototype
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Parent.prototype.say = function () {
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return this.name;
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};
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// child constructor
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function Child(name) {
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Parent.apply(this, arguments);
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}
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var kid = new Child("Patrick");
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console.log(kid.name); // "Patrick"
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// Drawback 1: nothing from the prototype gets inherited
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console.log(typeof kid.say); // "undefined"
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// Multiple Inheritance by Borrowing Constructors
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function Cat() {
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this.legs = 4;
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this.say = function () {
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return "meaowww";
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}
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}
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function Bird() {
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this.wings = 2;
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this.fly = true;
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}
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function CatWings() {
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Cat.apply(this);
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Bird.apply(this);
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}
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var jane = new CatWings();
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console.dir(jane);
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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<head>
4+
<title>JavaScript Patterns</title>
5+
<meta charset="utf-8">
6+
</head>
7+
<body>
8+
<script>
9+
/* Title: Classical Pattern #2 - Rent a Constructor (a pattern that should be generally avoided)
10+
Description: it borrows the parent constructor, passing the child object to be bound to this and also forwarding any arguments
11+
*/
12+
13+
// the parent constructor
14+
function Parent(name) {
15+
this.name = name || 'Adam';
16+
}
17+
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// adding functionality to the prototype
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Parent.prototype.say = function () {
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return this.name;
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};
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// child constructor
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function Child(name) {
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Parent.apply(this, arguments);
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}
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var kid = new Child("Patrick");
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console.log(kid.name); // "Patrick"
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// Drawback 1: nothing from the prototype gets inherited
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console.log(typeof kid.say); // "undefined"
33+
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// Multiple Inheritance by Borrowing Constructors
35+
function Cat() {
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this.legs = 4;
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this.say = function () {
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return "meaowww";
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}
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}
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function Bird() {
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this.wings = 2;
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this.fly = true;
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}
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function CatWings() {
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Cat.apply(this);
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Bird.apply(this);
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}
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var jane = new CatWings();
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console.dir(jane);
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// reference
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// http://shop.oreilly.com/product/9780596806767.do
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</script>
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</body>
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</html>

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