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30 lines
1.0 KiB
30 lines
1.0 KiB
'use strict'; |
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var $ = require('../internals/export'); |
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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 getSetIterator = require('../internals/get-set-iterator'); |
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var iterate = require('../internals/iterate'); |
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var $TypeError = TypeError; |
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// `Set.prototype.reduce` method |
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// https://github.com/tc39/proposal-collection-methods |
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$({ target: 'Set', proto: true, real: true, forced: true }, { |
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reduce: function reduce(callbackfn /* , initialValue */) { |
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var set = anObject(this); |
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var iterator = getSetIterator(set); |
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var noInitial = arguments.length < 2; |
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var accumulator = noInitial ? undefined : arguments[1]; |
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aCallable(callbackfn); |
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iterate(iterator, function (value) { |
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if (noInitial) { |
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noInitial = false; |
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accumulator = value; |
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} else { |
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accumulator = callbackfn(accumulator, value, value, set); |
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} |
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}, { IS_ITERATOR: true }); |
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if (noInitial) throw $TypeError('Reduce of empty set with no initial value'); |
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return accumulator; |
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} |
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});
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