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'use strict'; var $ = require('../internals/export'); var bind = require('../internals/function-bind-context'); var aSet = require('../internals/a-set'); var SetHelpers = require('../internals/set-helpers'); var iterate = require('../internals/set-iterate');
var Set = SetHelpers.Set; var add = SetHelpers.add;
// `Set.prototype.map` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Set', proto: true, real: true, forced: true }, { map: function map(callbackfn /* , thisArg */) { var set = aSet(this); var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined); var newSet = new Set(); iterate(set, function (value) { add(newSet, boundFunction(value, value, set)); }); return newSet; } });
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