package.json

{
  "name": "promise-map",
  "version": "1.0.0",
  "main": "./promise-map.js"
}

promise-map.js

'use strict';

module.exports = function promiseMap(mapperFn, arrOrArrPromise) {
  return Promise.resolve(arrOrArrPromise)
    .then(Promise.all.bind(Promise))
    .then(function(arr) {
      return Promise.all(arr.map(mapperFn));
    });
}