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20 lines
630 B
20 lines
630 B
import { isPromise } from './isPromise.mjs'; |
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/** |
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* Similar to Array.prototype.reduce(), however the reducing callback may return |
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* a Promise, in which case reduction will continue after each promise resolves. |
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* |
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* If the callback does not return a Promise, then this function will also not |
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* return a Promise. |
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*/ |
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export function promiseReduce(values, callbackFn, initialValue) { |
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let accumulator = initialValue; |
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for (const value of values) { |
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accumulator = isPromise(accumulator) |
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? accumulator.then((resolved) => callbackFn(resolved, value)) |
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: callbackFn(accumulator, value); |
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} |
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return accumulator; |
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}
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