A set of tools for working with arrays in an async manner
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README.md

Promise Arrays NPM version Travis Build MIT License

A super small library to help you map and filter arrays with async operations. The only hard dependency is Promise so it needs to be present some how in your project (polyfill or native).
Compatible with NodeJS, CommonJS, AMD and Browser Globals.

Install

Available on npm:

$ npm install promise-arrays --save

NodeJS

Install using npm Then:

// ES5:
var PromiseArrays = require('promise-arrays');

// ES6:
import PromiseArrays from 'promise-arrays';

AMD

Install npm and include in your AMD project, then:

// Include as dependency:
define(['promise-arrays'], function (PromiseArrays) {
    // Use Here...
});

Browser Globals

<script src="/path/to/promise-arrays.js"></script>

Usage

All methods in this library return a Promise object. The API is similar to JS native filter and map, although you can return a Promise instead of just returning the result.

PromiseArrays.map(array, callback) → Promise

Mutate elements of an array using a given callback. Return a value to replace the original item or a Promise object.

var array   = [1, 2, 3, 4, 5];

// Sync
var promise = PromiseArrays.map(array, function (item, index) {
    return item * 10;
}).then(function (result) {
    console.log(result); // [10, 20, 30, 40, 50]
});

// Async
var promise = PromiseArrays.map(array, function (item, index) {
    return new Promise(function (resolve, reject) {
        setTimeout(function () {
            resolve(item * 10);
        }, 100);
    });
}).then(function (result) {
    console.log(result); // [10, 20, 30, 40, 50] After ~ 100ms
});

You can also use each instead of map, which is basically an alias to map.

PromiseArrays.filter(array, callback) → Promise

Filter an array based on given criteria. API usage is similar to .map

var array   = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var promise = PromiseArrays.filter(array, function (item, index) {
    return item > 3 && item < 8; // OR return a Promise
}).then(function (result) {
    console.log(result); // [4, 5, 6, 7]
});

Test

$ npm test

Changelog

Version Date Notes
0.1.0 2015-09-13 resolve is no more passed to callbacks. Callbacks should return value or Promise
0.0.2 2015-09-10 Added tests
0.0.1 2015-09-04 Initial release

License

This software is released under the MIT License.

Copyright © 2015 Sallar Kaboli <sallar.kaboli@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.