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Filename : promiseReduce.js

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'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;
}