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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
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20
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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
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42
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43 TEST('millers_device', function()
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44 {
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45 var array = [];
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46 var obj = {};
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47 var fn = function(){};
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48
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49 assert( typeof array === 'object' );
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50 assert( '' + obj === '[object Object]' );
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51
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52 assert( obj.toString() === '[object Object]' );
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53
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54 var object_toString = obj.toString;
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55
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56 assert( object_toString.call(array) === '[object Array]' );
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57 assert( object_toString.call(fn) === '[object Function]' );
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58
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59 });
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60
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61
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62 TEST('return_arguments', function()
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63 {
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64 var return_arguments = function(){
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65 return arguments;
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66 };
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67
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68 var my_arguments = return_arguments(0, 1);
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69
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70 assert( my_arguments.length === 2 );
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71
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72 assert( my_arguments[0] === 0 );
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73 assert( my_arguments[1] === 1 );
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74
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75 assert( '' + my_arguments === '[object Object]' );
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76 assert( '' + [0, 1] === '0,1' );
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77
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78 var array_slice = [].slice;
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79 var my_arguments_fixed = array_slice.call( my_arguments );
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80
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81 assert( '' + my_arguments_fixed === '0,1');
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82
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83 var obj = {};
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84 assert( obj.toString.call( my_arguments_fixed ) === '[object Array]' );
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85
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86 });
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87
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88
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89 TEST('new', function()
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90 {
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91 var this_in_Fn;
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92
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93 var Fn = function(){
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94 this_in_Fn = this;
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95 };
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96
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97 this_in_Fn = null;
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98 var non_instance = Fn();
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99 assert( non_instance === undefined );
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100 assert( this_in_Fn.telltail === 'global');
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101
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102 this_in_Fn = null;
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103 var instance = new Fn();
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104 assert( instance === this_in_Fn );
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105 assert( instance.telltail === undefined );
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106
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107 Fn.prototype.telltail = 'instance-of-Fn';
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108 assert( instance.telltail === 'instance-of-Fn' );
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109
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110 Fn.prototype = {
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111 telltail : 'prototype-is-changed'
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112 };
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113 var second_instance = new Fn();
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114 assert( second_instance.telltail === 'prototype-is-changed' );
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115
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116 Fn.prototype = second_instance;
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117 second_instance.i = 42;
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118
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119 var third_instance = new Fn();
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120 assert( third_instance.telltail === 'prototype-is-changed' );
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121 assert( third_instance.i === 42 );
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122
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123 });
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