Two async map solutions with basic currying support

asyncMap.js

/**
 * Async map function with currying support
 * @param fn
 * @param arr
 * @return {function(*=)}
 */
export const asyncMap = (fn, arr) => {
  const asyncMapHelper = async arr => {
    const promiseArray = Array.prototype.map.call(arr, async x => fn(x));
    return await Promise.all(promiseArray);
  };
  return arr ? asyncMapHelper(arr) : asyncMapHelper;
};


/**
 * A little bit more elegant way to get the same result as above
 */
export const asyncMap2 = async function asyncMap2(fn, arr) {
  if (arr) {
    const promiseArray = Array.prototype.map.call(arr, async x => fn(x));
    return await Promise.all(promiseArray);
  } else {
    return asyncMap2.bind(null, fn);
  }
};

export default asyncMap;