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    3.1.4 • Public • Published


    async/await-ready array methods for Node.js

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    The @httpie/collections package provides a convenient wrapper to work with arrays.


    npm i @httpie/collections


    Find all the details and available methods in the extensive Supercharge docs.


    The package exports a function accepting an array as a parameter. From there, you can chain all collection methods.

    Sync Collections by default

    A created collection (Collect([1, 2, 3])) is synchronous by default. That means it behaves like JavaScript’s array methods.

    In contrast to JavaScript’s array methods, collections have a lot more methods available making your code a lot simpler. Here are basic examples using a collection:

    const User = require('../models/user')
    const Collect = require('@httpie/collections')
    const users = await User.findAll()
    const notSubscribedUsers = Collect(users)
      .filter(user => {
        return user.notSubscribedToNewsletter
    // notSubscribedUsers = [ <list of not-yet-subscribed users> ]

    Here’s another example outlining how to determine whether the array “has” an item:

    // “has” in JS Arrays
    const hasNotSubscribedUsers = !![].concat(users).find(user => {
      return user.notSubscribedToNewsletter
    // “has” in Collections
    const hasNotSubscribedUsers = Collect(users).has(user => {
      return user.notSubscribedToNewsletter

    All available methods are outlined in the docs.

    Async Collections

    The package is async/await-ready and supports async callback functions. A collection becomes async (returns a promise) as soon as you provide an async callback method to methods like map, filter, find, and so on. You then need to await the collection pipeline:

    const User = require('../models/user')
    const Collect = require('@httpie/collections')
    const users = await User.findAll()
    const subscribedUsers = await Collect(users)
      .filter(user => {
        return user.notSubscribedToNewsletter
      .map(async user => { // <-- providing an async callback creates an async collection that you need to `await`
        await user.subscribeToNewsletter()
        return user
    // subscribedUsers = [ <list of newly-subscribed users> ]

    You can directly await async collections without ending the call chain with .all(). You can still call .all() though, it works as well.


    Do you miss a collection function? We very much appreciate your contribution! Please send in a pull request 😊

    1. Create a fork
    2. Create your feature branch: git checkout -b my-feature
    3. Commit your changes: git commit -am 'Add some feature'
    4. Push to the branch: git push origin my-new-feature
    5. Submit a pull request 🚀


    MIT © Supercharge

    httpiejs.com  ·  GitHub @httpie  ·  Twitter @httpiejs


    npm i @httpie/collections

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