'use strict';
+var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var definePropertyModule = require('../internals/object-define-property');
var getPrototypeOf = require('../internals/object-get-prototype-of');
// https://tc39.es/ecma262/#sec-function.prototype-@@hasinstance
if (!(HAS_INSTANCE in FunctionPrototype)) {
definePropertyModule.f(FunctionPrototype, HAS_INSTANCE, { value: function (O) {
- if (typeof this != 'function' || !isObject(O)) return false;
- if (!isObject(this.prototype)) return O instanceof this;
+ if (!isCallable(this) || !isObject(O)) return false;
+ var P = this.prototype;
+ if (!isObject(P)) return O instanceof this;
// for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this:
- while (O = getPrototypeOf(O)) if (this.prototype === O) return true;
+ while (O = getPrototypeOf(O)) if (P === O) return true;
return false;
} });
}