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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | 1x 1x 12x 11x 10x 10x 10x 3x 3x 1x 2x 2x 9x 400x 8x 1x | const {
validateIsIterable,
validateIsFunction,
validateNonZeroLength
} = require('./validation'),
{ noParam } = require('./constants');
/**
* Async Reduce
*
* Reduce asynchronously and resolve when
* all items have been transduced.
* @async
* @param {any[]} iterable
* @param {Function} callback - callback(accumulator, currentValue, index, array)
* @param {any} [accumulator=noParam]
* @return {Promise<any>}
* @throws {TypeError}
*/
async function asyncReduce(iterable, callback, accumulator = noParam) {
validateIsIterable(iterable);
validateIsFunction(callback);
const length = iterable.length;
let i = 0;
if (accumulator === noParam) {
try {
validateNonZeroLength(iterable);
} catch (e) {
throw new TypeError(
'asyncReduce of empty array with no accumulator given'
);
}
accumulator = iterable[0];
i = 1;
}
for (; i < length; i++) {
// eslint-disable-next-line no-await-in-loop
accumulator = await callback(accumulator, iterable[i], i, iterable);
}
return accumulator;
}
module.exports = { asyncReduce };
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