es6.function.has-instance.js

/node_modules/babel-polyfill/node_modules/core-js/library/modules/es6.function.has-instance.js

https://bitbucket.org/worklabschd/bingle_customer2 · JavaScript · 13 lines · 11 code · 0 blank · 2 comment · 7 complexity · 2860024eaea6b403a692497ef4c803b3 MD5 · raw file


'use strict';
var isObject = require('./_is-object');
var getPrototypeOf = require('./_object-gpo');
var HAS_INSTANCE = require('./_wks')('hasInstance');
var FunctionProto = Function.prototype;
// 19.2.3.6 Function.prototype[@@hasInstance](V)
if (!(HAS_INSTANCE in FunctionProto)) require('./_object-dp').f(FunctionProto, HAS_INSTANCE, { value: function (O) {
  if (typeof this != 'function' || !isObject(O)) return false;
  if (!isObject(this.prototype)) 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;
  return false;
} });