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13 lines
623 B
13 lines
623 B
'use strict'; |
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var $ = require('./$') |
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, isObject = require('./$.is-object') |
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, HAS_INSTANCE = require('./$.wks')('hasInstance') |
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, FunctionProto = Function.prototype; |
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// 19.2.3.6 Function.prototype[@@hasInstance](V) |
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if(!(HAS_INSTANCE in FunctionProto))$.setDesc(FunctionProto, HAS_INSTANCE, {value: function(O){ |
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if(typeof this != 'function' || !isObject(O))return false; |
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if(!isObject(this.prototype))return O instanceof this; |
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// for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this: |
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while(O = $.getProto(O))if(this.prototype === O)return true; |
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return false; |
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}}); |