Created
August 17, 2020 23:41
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sequential async sum with reduce
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| const numbers = [2, 5, 1, 3, 4]; | |
| function asyncNumber (n) { | |
| return new Promise((resolve, reject) => { resolve(n) }); | |
| } | |
| async function asyncSum (numbers) { | |
| return numbers.reduce(async (prevSum, n) => { | |
| const sum = await prevSum; | |
| return asyncNumber(sum + n); | |
| }, Promise.resolve(0)); | |
| } | |
| asyncSum(numbers).then(final => console.log('resolved:', final)); | |
| // resolved: 15 |
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