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huazhiyu/node_modules/core-js/modules/esnext.map.find-key.js

18 lines
704 B

'use strict';
var $ = require('../internals/export');
var bind = require('../internals/function-bind-context');
var aMap = require('../internals/a-map');
var iterate = require('../internals/map-iterate');
// `Map.prototype.findKey` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: true }, {
findKey: function findKey(callbackfn /* , thisArg */) {
var map = aMap(this);
var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
var result = iterate(map, function (value, key) {
if (boundFunction(value, key, map)) return { key: key };
}, true);
return result && result.key;
}
});