npm package: @httpie/collections
Description: HTTPie collections
Author: Patrick LUZOLO
Latest version: 3.1.4

<div align="center">
  <a href="https://httpiejs.com">
    <img width="471" style="max-width:100%;" src="https://httpiejs.com/images/httpie-text.svg" />
  </a>
  <br/>
  <br/>
  <p>
    <h3>Collections</h3>
  </p>
  <p>
    <strong><code>async/await-ready</code></strong> array methods for Node.js
  </p>
  <br/>
  <p>
    <a href="#installation"><strong>Installation</strong></a> ·
    <a href="#Docs"><strong>Docs</strong></a> ·
    <a href="#usage"><strong>Usage</strong></a>
  </p>
  <br/>
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  <p>
    <a href="https://www.npmjs.com/package/@httpie/collections"><img src="https://img.shields.io/npm/v/@httpie/collections.svg" alt="Latest Version"></a>
    <a href="https://www.npmjs.com/package/@httpie/collections"><img src="https://img.shields.io/npm/dm/@httpie/collections.svg" alt="Monthly downloads"></a>
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    <em>Follow <a href="http://twitter.com/marcuspoehls">@marcuspoehls</a> and <a href="http://twitter.com/httpiejs">@httpiejs</a> for updates!</em>
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</div>

---

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


## Installation

```
npm i @httpie/collections
```


## Docs
Find all the [details and available methods in the extensive Supercharge docs](https://httpiejs.com/docs/collections).


## Usage
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:

```js
const User = require('../models/user')
const Collect = require('@httpie/collections')

const users = await User.findAll()

const notSubscribedUsers = Collect(users)
  .filter(user => {
    return user.notSubscribedToNewsletter
  })
  .all()

// notSubscribedUsers = [ <list of not-yet-subscribed users> ]
```

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

```js
// “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](https://httpiejs.com/docs/collections).


### 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:

```js
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.


## Contributing
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 🚀


## License
MIT © [Supercharge](https://httpiejs.com)

---

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