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Editing: esnext.map.find-key.js
'use strict'; var $ = require('../internals/export'); var anObject = require('../internals/an-object'); var bind = require('../internals/function-bind-context'); var getMapIterator = require('../internals/get-map-iterator'); var iterate = require('../internals/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 = anObject(this); var iterator = getMapIterator(map); var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined); return iterate(iterator, function (key, value, stop) { if (boundFunction(value, key, map)) return stop(key); }, { AS_ENTRIES: true, IS_ITERATOR: true, INTERRUPTED: true }).result; } });
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