one-by-one

one-by-one

Run async tasks one by one.

If you want to run async functions in parallel, check out same-time.

:cloud: Installation

$ npm i --save one-by-one

:clipboard: Example

const oneByOne = require("one-by-one");

// Call these functions one by one
oneByOne([
    cb => {
        setTimeout(function () {
            cb(null, "Hello World");
        }, 1000);
    }
  , (cb, data) => {
        console.log(data);
        // => "Hello World"
        setTimeout(function () {
            cb(new Error("Some error"));
        }, 100);
    }
  , cb => {
        // This will NOT be triggered because the
        // previous sent an error
        cb(null, null);
    }
], (err, data) => {
    console.log(err, data);
    // => [Error: Some error] [ 'Hello World' ]
});

// Call these functions one by one
oneByOne([
    Math.random() > 0.5 ? next => {
        console.log("Generated a random number greater than 0.5.");
        next();
    } : null
  , cb => setTimeout(
        () => cb(null, "Hello World")
      , 1000
    )
  , (cb, prev) => setTimeout(
        () => cb(null, prev.replace("World", "Mars"))
      , 1000
    )
], (err, data, message) => {
    console.log(err, data, message);
    // null [ 'Hello World', 'Hello Mars' ] 'Hello Mars'
});

:memo: Documentation

oneByOne(arr, cb)

Calls functions one by one and memorizes the results.

Params

• Array arr: An array of functions getting the callback parameter in the first argument and response arguments from the previous function call.
• Function cb: The callback function called with an error (or null) and the results array.

Return

• oneByOne The oneByOne function.

:yum: How to contribute

Have an idea? Found a bug? See how to contribute.

:moneybag: Donations

Another way to support the development of my open-source modules is to set up a recurring donation, via Patreon. :rocket:

PayPal donations are appreciated too! Each dollar helps.

Thanks! :heart:

:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

• asyncer.js—Run groups of (a)sync functions.
• babel-it—Babelify your code before npm publish.
• blah—A command line tool to optimize the repetitive actions.
• cdnjs-importer—Easy way to import a library into CDNJS.
• cobol—COBOL bridge for NodeJS which allows you to run COBOL code from NodeJS.
• engine-tools (by jillix)—Engine Tools library and CLI app.
• fortran—Fortran bridge for Node.js which allows you to run Fortran code from Node.js.
• gif-cli—Gif animations in your terminal!
• git-package-json—Get the package.json contents from git repositories.
• git-stats-importer—Imports your commits from a repository into git-stats history.
• gpm—npm + git = gpm - Install NPM packages and dependencies from git repositories.
• gry—A minimalist NodeJS wrapper for the git commands. gry stands for the Git RepositorY.
• image-to-ascii—A Node.JS module that converts images to ASCII art.
• made-in-brazil—A list of neat projects made in Brazil.
• made-in-india—A list of neat projects made in India.
• made-in-romania—A list of cool projects made in Romania.
• nodeice—Another PDF invoice generator
• np-init—Easily start a npm package from scratch.
• ship-release—Publish new versions on GitHub and npm with ease.
• ssh-remote—Automagically switch on the SSH remote url in a Git repository.
• tester-init—Init tests for tester.
• tilda-init—Init cli applications.

:scroll: License

MIT © Ionică Bizău