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https://github.com/doowb/group-array

Group array of objects into lists.
https://github.com/doowb/group-array
Last synced: 14 days ago
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Group array of objects into lists.
Host: GitHub
URL: https://github.com/doowb/group-array
Owner: doowb
License: mit
Created: 2015-07-19T18:29:40.000Z (over 9 years ago)
Default Branch: master
Last Pushed: 2023-10-12T16:57:17.000Z (about 1 year ago)
Last Synced: 2024-10-04T11:58:14.675Z (about 1 month ago)
Language: JavaScript
Size: 47.9 KB
Stars: 61
Watchers: 3
Forks: 14
Open Issues: 1
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project

README

        # group-array [![NPM version](https://img.shields.io/npm/v/group-array.svg?style=flat)](https://www.npmjs.com/package/group-array) [![NPM monthly downloads](https://img.shields.io/npm/dm/group-array.svg?style=flat)](https://npmjs.org/package/group-array) [![NPM total downloads](https://img.shields.io/npm/dt/group-array.svg?style=flat)](https://npmjs.org/package/group-array) [![Linux Build Status](https://img.shields.io/travis/doowb/group-array.svg?style=flat&label=Travis)](https://travis-ci.org/doowb/group-array)

> Group array of objects into lists.

Please consider following this project's author, [Brian Woodward](https://github.com/doowb), and consider starring the project to show your :heart: and support.

- [Install](#install)

- [Usage](#usage)

- [Examples](#examples)

- [About](#about)

_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_

## Install

Install with [npm](https://www.npmjs.com/):

```sh

$ npm install --save group-array

```

## Usage

```js

var groupArray = require('group-array');

```

## Examples

```js

var arr = [

  {tag: 'one', content: 'A'},

  {tag: 'one', content: 'B'},

  {tag: 'two', content: 'C'},

  {tag: 'two', content: 'D'},

  {tag: 'three', content: 'E'},

  {tag: 'three', content: 'F'}

];

// group by the `tag` property

groupArray(arr, 'tag');

```

**results in:**

```js

{

  one: [

    {tag: 'one', content: 'A'},

    {tag: 'one', content: 'B'}

  ],

  two: [

    {tag: 'two', content: 'C'},

    {tag: 'two', content: 'D'}

  ],

  three: [

    {tag: 'three', content: 'E'},

    {tag: 'three', content: 'F'}

  ]

}

```

**Group by multiple, deeply nested properties**

```js

// given an array of object, like blog posts...

var arr = [

  { data: { year: '2016', tag: 'one', month: 'jan', day: '01'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'jan', day: '01'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'jan', day: '02'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'jan', day: '02'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'feb', day: '10'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'feb', day: '10'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'feb', day: '12'}, content: '...'},

  { data: { year: '2016', tag: 'one', month: 'feb', day: '12'}, content: '...'},

  { data: { year: '2016', tag: 'two', month: 'jan', day: '14'}, content: '...'},

  { data: { year: '2016', tag: 'two', month: 'jan', day: '14'}, content: '...'},

  { data: { year: '2016', tag: 'two', month: 'jan', day: '16'}, content: '...'},

  { data: { year: '2016', tag: 'two', month: 'jan', day: '16'}, content: '...'},

  { data: { year: '2016', tag: 'two', month: 'feb', day: '18'}, content: '...'},

  { data: { year: '2017', tag: 'two', month: 'feb', day: '18'}, content: '...'},

  { data: { year: '2017', tag: 'two', month: 'feb', day: '10'}, content: '...'},

  { data: { year: '2017', tag: 'two', month: 'feb', day: '10'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'jan', day: '01'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'jan', day: '01'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'jan', day: '02'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'jan', day: '02'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'feb', day: '01'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'feb', day: '01'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'feb', day: '02'}, content: '...'},

  { data: { year: '2017', tag: 'three', month: 'feb', day: '02'}, content: '...'}

]

```

Pass a list or array of properties:

```js

groupArray(arr, 'data.year', 'data.tag', 'data.month', 'data.day');

```

**Results in something like this: (abbreviated)**

```js

{ '2016': 

   { one: 

      { jan: 

         { '01': 

            [ { data: { year: '2016', tag: 'one', month: 'jan', day: '01' },

                content: '...' },

              { data: { year: '2016', tag: 'one', month: 'jan', day: '01' },

                content: '...' } ],

           '02': 

            [ { data: { year: '2016', tag: 'one', month: 'jan', day: '02' },

                content: '...' },

              { data: { year: '2016', tag: 'one', month: 'jan', day: '02' },

                content: '...' } ] },

        feb: 

         { '10': 

            [ { data: { year: '2016', tag: 'one', month: 'feb', day: '10' },

                content: '...' },

              { data: { year: '2016', tag: 'one', month: 'feb', day: '10' },

                content: '...' } ],

           '12': 

            [ { data: { year: '2016', tag: 'one', month: 'feb', day: '12' },

                content: '...' },

              { data: { year: '2016', tag: 'one', month: 'feb', day: '12' },

                content: '...' } ] } },

     two: 

      { jan: 

         { '14': 

            [ { data: { year: '2016', tag: 'two', month: 'jan', day: '14' },

                content: '...' },

              { data: { year: '2016', tag: 'two', month: 'jan', day: '14' },

                content: '...' } ],

           '16': 

            [ { data: { year: '2016', tag: 'two', month: 'jan', day: '16' },

                content: '...' },

              { data: { year: '2016', tag: 'two', month: 'jan', day: '16' },

                content: '...' } ] },

        feb: 

         { '18': 

            [ { data: { year: '2016', tag: 'two', month: 'feb', day: '18' },

                content: '...' } ] } } },

  '2017': 

   { two: 

      { feb: 

         { '10': 

            [ { data: { year: '2017', tag: 'two', month: 'feb', day: '10' },

                content: '...' },

              { data: { year: '2017', tag: 'two', month: 'feb', day: '10' },

                content: '...' } ],

           '18': 

            [ { data: { year: '2017', tag: 'two', month: 'feb', day: '18' },

                content: '...' } ] } },

     three: 

      { jan: 

         { '01': 

            [ { data: { year: '2017', tag: 'three', month: 'jan', day: '01' },

                content: '...' },

              { data: { year: '2017', tag: 'three', month: 'jan', day: '01' },

                content: '...' } ],

           '02': 

            [ { data: { year: '2017', tag: 'three', month: 'jan', day: '02' },

                content: '...' },

              { data: { year: '2017', tag: 'three', month: 'jan', day: '02' },

                content: '...' } ] },

        feb: 

         { '01': 

            [ { data: { year: '2017', tag: 'three', month: 'feb', day: '01' },

                content: '...' },

              { data: { year: '2017', tag: 'three', month: 'feb', day: '01' },

                content: '...' } ],

           '02': 

            [ { data: { year: '2017', tag: 'three', month: 'feb', day: '02' },

                content: '...' },

              { data: { year: '2017', tag: 'three', month: 'feb', day: '02' },

                content: '...' } ] } } } }

```

## About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

```sh

$ npm install && npm test

```

Building docs

_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_

To generate the readme, run the following command:

```sh

$ npm install -g verbose/verb#dev verb-generate-readme && verb

```

### Related projects

You might also be interested in these projects:

* [arr-flatten](https://www.npmjs.com/package/arr-flatten): Recursively flatten an array or arrays. | [homepage](https://github.com/jonschlinkert/arr-flatten "Recursively flatten an array or arrays.")

* [get-value](https://www.npmjs.com/package/get-value): Use property paths like 'a.b.c' to get a nested value from an object. Even works… [more](https://github.com/jonschlinkert/get-value) | [homepage](https://github.com/jonschlinkert/get-value "Use property paths like 'a.b.c' to get a nested value from an object. Even works when keys have dots in them (no other dot-prop library can do this!).")

* [group-object](https://www.npmjs.com/package/group-object): Group object keys and values into lists. | [homepage](https://github.com/doowb/group-object "Group object keys and values into lists.")

* [union-value](https://www.npmjs.com/package/union-value): Set an array of unique values as the property of an object. Supports setting deeply… [more](https://github.com/jonschlinkert/union-value) | [homepage](https://github.com/jonschlinkert/union-value "Set an array of unique values as the property of an object. Supports setting deeply nested properties using using object-paths/dot notation.")

### Contributors

| **Commits** | **Contributor** |  

| --- | --- |  

| 32 | [doowb](https://github.com/doowb) |  

| 13 | [jonschlinkert](https://github.com/jonschlinkert) |  

| 2  | [johlym](https://github.com/johlym) |  

| 1  | [cperryk](https://github.com/cperryk) |  

### Author

**Brian Woodward**

* [GitHub Profile](https://github.com/doowb)

* [Twitter Profile](https://twitter.com/doowb)

* [LinkedIn Profile](https://linkedin.com/in/woodwardbrian)

### License

Copyright © 2019, [Brian Woodward](https://github.com/doowb).

Released under the [MIT License](LICENSE).

***

_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on July 22, 2019._