Mercurial > js4py

annotate core-javascript/tutorial.js @ 111:73859bf6d639 core-javascript

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Add about-new, arguments and millers-device (and include from tutorial.js).
author jf3243
date Wed, 26 Oct 2011 16:32:34 +0100
parents f015a6838eb7
children df92f9f165c7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
109
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1 var telltail = 'global';
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2
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3 var TEST = function(title, code){
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4 print( 'Testing: ' + title );
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5 code();
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6 };
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7
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8 var assert = function(arg){
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9 if(!arg){
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10 ddt();
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11 }
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12 };
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13
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14 '0' == 0 || ddt;
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15 0 == '' || ddt;
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16 '0' != '' || ddt;
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17 NaN != NaN || ddt;
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18
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19
110
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20 // start return_this
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21 TEST('return_this', function()
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22 {
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23 var return_this = function(){
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24 return this;
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25 };
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26
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27 var default_this = return_this();
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28
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29 assert( default_this.telltail === 'global' );
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30
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31 var obj = {};
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32 obj.return_this = return_this;
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33 assert( obj.return_this === return_this );
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34
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35 assert( obj.return_this() === obj );
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36
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37 assert( return_this.call(obj) === obj );
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38 assert( return_this.apply(obj) === obj );
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39
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40 });
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41 // end return_this
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42
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43
111
73859bf6d639 Add about-new, arguments and millers-device (and include from tutorial.js).
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44 // start millers-device
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45 TEST('millers-device', function()
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46 {
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47 var array = [];
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48 var obj = {};
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49 var fn = function(){};
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50
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51 assert( typeof array === 'object' );
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52 assert( '' + obj === '[object Object]' );
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53
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54 assert( obj.toString() === '[object Object]' );
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55
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56 var object_toString = obj.toString;
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57
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58 assert( object_toString.call(array) === '[object Array]' );
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59 assert( object_toString.call(fn) === '[object Function]' );
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60
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61 });
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62 // end millers-device
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63
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64
111
73859bf6d639 Add about-new, arguments and millers-device (and include from tutorial.js).
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65 // start return_arguments
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66 TEST('return_arguments', function()
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67 {
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68 var return_arguments = function(){
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69 return arguments;
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70 };
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71
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72 var my_arguments = return_arguments(0, 1);
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73
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74 assert( my_arguments.length === 2 );
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75
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76 assert( my_arguments[0] === 0 );
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77 assert( my_arguments[1] === 1 );
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78
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79 assert( '' + my_arguments === '[object Object]' );
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80 assert( '' + [0, 1] === '0,1' );
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81
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82 var array_slice = [].slice;
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83 var my_arguments_fixed = array_slice.call( my_arguments );
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84
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85 assert( '' + my_arguments_fixed === '0,1');
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86
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87 var obj = {};
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88 assert( obj.toString.call( my_arguments_fixed ) === '[object Array]' );
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89
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90 });
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91 // end return_arguments
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92
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93
111
73859bf6d639 Add about-new, arguments and millers-device (and include from tutorial.js).
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94 // start new-operator
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95 TEST('new-operator', function()
109
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96 {
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97 var this_in_Fn;
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98
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99 var Fn = function(){
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100 this_in_Fn = this;
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101 };
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102
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103 this_in_Fn = null;
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104 var non_instance = Fn();
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105 assert( non_instance === undefined );
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106 assert( this_in_Fn.telltail === 'global');
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107
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108 this_in_Fn = null;
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109 var instance = new Fn();
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110 assert( instance === this_in_Fn );
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111 assert( instance.telltail === undefined );
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112
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113 Fn.prototype.telltail = 'instance-of-Fn';
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114 assert( instance.telltail === 'instance-of-Fn' );
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115
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116 Fn.prototype = {
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117 telltail : 'prototype-is-changed'
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118 };
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119 var second_instance = new Fn();
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120 assert( second_instance.telltail === 'prototype-is-changed' );
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121
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122 Fn.prototype = second_instance;
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123 second_instance.i = 42;
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124
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125 var third_instance = new Fn();
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126 assert( third_instance.telltail === 'prototype-is-changed' );
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127 assert( third_instance.i === 42 );
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128
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129 });
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130 // end new-operator