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