pure-promise

Collection of functional utilities for working with native promises

Install

$ npm install pure-promise
# or
$ yarn add pure-promise

Usage

reduce

Serially reduce an array, or promise for an array

import {reduce} from 'pure-promise';

const sum = await reduce([
  Promise.resolve(1),
  2,
  3
], (prev, next) => prev + next);

console.log(sum); // 6 

map

Concurrently map through an array, or promise for an array

import {map} from 'pure-promise';

const plusOne = await map([
  1,
  2,
  Promise.resolve(3)
], (value) => value + 1);

console.log(plusOne); // [2, 3, 4]

mapSeries

Serially map through an array, or promise for an array

import {mapSeries} from 'pure-promise';

const plusOne = await mapSeries([
  Promise.resolve(1),
  2,
  3
], (value) => value + 1);

console.log(plusOne); // [2, 3, 4]

filter

Concurrently filter values from an array, or promise for an array

import {filter} from 'pure-promise';

const plusOne = await filter([
  1,
  Promise.resolve(2),
  3
], (value) => value % 2 === 0);

console.log(plusOne); // [2]

props

Concurrently resolves an object or arrays values into their key/value pairs

import {props} from 'pure-promise';

const plusOne = await props({
  key1: Promise.resolve(1),
  key2: 2
});

console.log(plusOne); // { key1: 1, key2: 2 }

pipe

Concurrently pipes the results of the previous function into the next

import {pipe} from 'pure-promise';

const pipeline = pipe(
  (a) => a + 1, // a = 1
  (b) => Promise.resolve(b * 2) // b = 2
);

const result = await pipeline(1);

console.log(result); // 4