es7.object.lookup-setter.js

'use strict';
var $export = require('./_export');
var toObject = require('./_to-object');
var toPrimitive = require('./_to-primitive');
var getPrototypeOf = require('./_object-gpo');
var getOwnPropertyDescriptor = require('./_object-gopd').f;

// B.2.2.5 Object.prototype.__lookupSetter__(P)
require('./_descriptors') && $export($export.P + require('./_object-forced-pam'), 'Object', {
  __lookupSetter__: function __lookupSetter__(P) {
    var O = toObject(this);
    var K = toPrimitive(P, true);
    var D;
    do {
      if (D = getOwnPropertyDescriptor(O, K)) return D.set;
    } while (O = getPrototypeOf(O));
  }
});