You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28 lines
759 B
28 lines
759 B
4 months ago
|
'use strict';
|
||
|
|
||
|
Object.defineProperty(exports, '__esModule', {
|
||
|
value: true,
|
||
|
});
|
||
|
exports.promiseReduce = promiseReduce;
|
||
|
|
||
|
var _isPromise = require('./isPromise.js');
|
||
|
|
||
|
/**
|
||
|
* Similar to Array.prototype.reduce(), however the reducing callback may return
|
||
|
* a Promise, in which case reduction will continue after each promise resolves.
|
||
|
*
|
||
|
* If the callback does not return a Promise, then this function will also not
|
||
|
* return a Promise.
|
||
|
*/
|
||
|
function promiseReduce(values, callbackFn, initialValue) {
|
||
|
let accumulator = initialValue;
|
||
|
|
||
|
for (const value of values) {
|
||
|
accumulator = (0, _isPromise.isPromise)(accumulator)
|
||
|
? accumulator.then((resolved) => callbackFn(resolved, value))
|
||
|
: callbackFn(accumulator, value);
|
||
|
}
|
||
|
|
||
|
return accumulator;
|
||
|
}
|