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Doodle3D-API/jspm_packages/npm/core-js@0.9.18/modules/es6.function.has-instance.js

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2015-07-15 15:06:18 +02:00
/* */
var $ = require("./$"),
HAS_INSTANCE = require("./$.wks")('hasInstance'),
FunctionProto = Function.prototype;
if (!(HAS_INSTANCE in FunctionProto))
$.setDesc(FunctionProto, HAS_INSTANCE, {value: function(O) {
if (!$.isFunction(this) || !$.isObject(O))
return false;
if (!$.isObject(this.prototype))
return O instanceof this;
while (O = $.getProto(O))
if (this.prototype === O)
return true;
return false;
}});