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sequence

v3.0.0

Published

Execute async code in chronological order. The sequence module of FuturesJS (Browser, Node.js, Bower, and Pakmanager)

Downloads

26,083

Readme

Sequence

Creates an Asynchronous Stack which execute each enqueued method after the previous function calls the provided next(err, data [, ...]).

In many cases forEachAsync or forAllAsync will be a better alternative.

API

  • Sequence.create(defaultContext=null)
  • then(function callback(next, err, data [, ...]) {}, context) - add a callback onto the queue
    • begins or resumes the queue
    • passes the results of the previous function into the next

Node.js Installation

Node.JS (Server):

npm install sequence

Browser Installation

You can install from bower:

bower install sequence

Or download the raw file from https://raw.github.com/FuturesJS/sequence/master/sequence.js:

wget https://raw.github.com/FuturesJS/sequence/master/sequence.js

Or build with pakmanager:

pakmanager build sequence

Usage

(function (exports) {
  'use strict';

  var Sequence = exports.Sequence || require('sequence').Sequence
    , sequence = Sequence.create()
    , err
    ;

  sequence
    .then(function (next) {
      setTimeout(function () {
        next(err, "Hi", "World!");
      }, 120);
    })
    .then(function (next, err, a, b) {
      setTimeout(function () {
        next(err, "Hello", b);
      }, 270);
    })
    .then(function (next, err, a, b) {
      setTimeout(function () {
        console.log(a, b);
        next();
      }, 50);
    });

// so that this example works in browser and node.js
}('undefined' !== typeof exports && exports || new Function('return this')()));