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/** Async version of Array.prototype.reduce() | |
* await reduce(['/foo', '/bar', '/baz'], async (acc, v) => { | |
* acc[v] = await (await fetch(v)).json(); | |
* return acc; | |
* }, {}); | |
*/ | |
export async function reduce(arr, fn, val, pure) { | |
for (let i=0; i<arr.length; i++) { | |
let v = await fn(val, arr[i], i, arr); | |
if (pure!==false) val = v; |