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Filename : esnext.map.key-of.js

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'use strict';
var $ = require('../internals/export');
var anObject = require('../internals/an-object');
var getMapIterator = require('../internals/get-map-iterator');
var iterate = require('../internals/iterate');

// `Map.prototype.keyOf` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: true }, {
  keyOf: function keyOf(searchElement) {
    return iterate(getMapIterator(anObject(this)), function (key, value, stop) {
      if (value === searchElement) return stop(key);
    }, { AS_ENTRIES: true, IS_ITERATOR: true, INTERRUPTED: true }).result;
  }
});