| 1 | ;
|
| 2 | var $ = require('../internals/export');
|
| 3 | var aMap = require('../internals/a-map');
|
| 4 | var iterate = require('../internals/map-iterate');
|
| 5 |
|
| 6 | // `Map.prototype.keyOf` method
|
| 7 | // https://github.com/tc39/proposal-collection-methods
|
| 8 | $({ target: 'Map', proto: true, real: true, forced: true }, {
|
| 9 | keyOf: function keyOf(searchElement) {
|
| 10 | var result = iterate(aMap(this), function (value, key) {
|
| 11 | if (value === searchElement) return { key: key };
|
| 12 | }, true);
|
| 13 | return result && result.key;
|
| 14 | }
|
| 15 | });
|