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22 lines
413 B
22 lines
413 B
'use strict'; |
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module.exports = (iterable, reducer, initVal) => new Promise((resolve, reject) => { |
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const iterator = iterable[Symbol.iterator](); |
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let i = 0; |
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const next = total => { |
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const el = iterator.next(); |
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if (el.done) { |
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resolve(total); |
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return; |
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} |
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Promise.all([total, el.value]) |
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.then(value => { |
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next(reducer(value[0], value[1], i++)); |
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}) |
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.catch(reject); |
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}; |
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next(initVal); |
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});
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