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27 lines
1.1 KiB
27 lines
1.1 KiB
3 years ago
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'use strict';
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var $ = require('../internals/export');
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var getBuiltIn = require('../internals/get-built-in');
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var bind = require('../internals/function-bind-context');
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var call = require('../internals/function-call');
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var speciesConstructor = require('../internals/species-constructor');
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var getSetIterator = require('../internals/get-set-iterator');
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var iterate = require('../internals/iterate');
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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 = anObject(this);
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var iterator = getSetIterator(set);
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var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
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var newSet = new (speciesConstructor(set, getBuiltIn('Set')))();
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var adder = aCallable(newSet.add);
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iterate(iterator, function (value) {
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call(adder, newSet, boundFunction(value, value, set));
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}, { IS_ITERATOR: true });
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return newSet;
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}
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});
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