233 lines
9.2 KiB
Markdown
233 lines
9.2 KiB
Markdown
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# group-array [](https://www.npmjs.com/package/group-array) [](https://npmjs.org/package/group-array) [](https://npmjs.org/package/group-array) [](https://travis-ci.org/doowb/group-array)
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> Group array of objects into lists.
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## Table of Contents
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- [Install](#install)
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- [Usage](#usage)
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- [Examples](#examples)
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- [About](#about)
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_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save group-array
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```
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## Usage
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```js
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var groupArray = require('group-array');
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```
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## Examples
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```js
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var arr = [
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{tag: 'one', content: 'A'},
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{tag: 'one', content: 'B'},
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{tag: 'two', content: 'C'},
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{tag: 'two', content: 'D'},
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{tag: 'three', content: 'E'},
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{tag: 'three', content: 'F'}
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];
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// group by the `tag` property
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groupArray(arr, 'tag');
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```
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**results in:**
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```js
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{
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one: [
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{tag: 'one', content: 'A'},
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{tag: 'one', content: 'B'}
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],
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two: [
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{tag: 'two', content: 'C'},
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{tag: 'two', content: 'D'}
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],
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three: [
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{tag: 'three', content: 'E'},
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{tag: 'three', content: 'F'}
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]
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}
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```
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**Group by multiple, deeply nested properties**
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```js
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// given an array of object, like blog posts...
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var arr = [
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '01'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '01'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '02'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '02'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '10'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '10'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '12'}, content: '...'},
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '12'}, content: '...'},
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '14'}, content: '...'},
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '14'}, content: '...'},
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '16'}, content: '...'},
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '16'}, content: '...'},
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{ data: { year: '2016', tag: 'two', month: 'feb', day: '18'}, content: '...'},
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{ data: { year: '2017', tag: 'two', month: 'feb', day: '18'}, content: '...'},
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{ data: { year: '2017', tag: 'two', month: 'feb', day: '10'}, content: '...'},
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{ data: { year: '2017', tag: 'two', month: 'feb', day: '10'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '01'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '01'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '02'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '02'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '01'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '01'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '02'}, content: '...'},
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '02'}, content: '...'}
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]
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```
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Pass a list or array of properties:
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```js
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groupArray(arr, 'data.year', 'data.tag', 'data.month', 'data.day');
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```
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**Results in something like this: (abbreviated)**
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```js
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{ '2016':
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{ one:
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{ jan:
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{ '01':
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[ { data: { year: '2016', tag: 'one', month: 'jan', day: '01' },
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content: '...' },
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '01' },
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content: '...' } ],
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'02':
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[ { data: { year: '2016', tag: 'one', month: 'jan', day: '02' },
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content: '...' },
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{ data: { year: '2016', tag: 'one', month: 'jan', day: '02' },
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content: '...' } ] },
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feb:
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{ '10':
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[ { data: { year: '2016', tag: 'one', month: 'feb', day: '10' },
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content: '...' },
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '10' },
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content: '...' } ],
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'12':
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[ { data: { year: '2016', tag: 'one', month: 'feb', day: '12' },
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content: '...' },
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{ data: { year: '2016', tag: 'one', month: 'feb', day: '12' },
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content: '...' } ] } },
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two:
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{ jan:
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{ '14':
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[ { data: { year: '2016', tag: 'two', month: 'jan', day: '14' },
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content: '...' },
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '14' },
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content: '...' } ],
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'16':
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[ { data: { year: '2016', tag: 'two', month: 'jan', day: '16' },
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content: '...' },
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{ data: { year: '2016', tag: 'two', month: 'jan', day: '16' },
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content: '...' } ] },
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feb:
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{ '18':
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[ { data: { year: '2016', tag: 'two', month: 'feb', day: '18' },
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content: '...' } ] } } },
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'2017':
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{ two:
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{ feb:
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{ '10':
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[ { data: { year: '2017', tag: 'two', month: 'feb', day: '10' },
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content: '...' },
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{ data: { year: '2017', tag: 'two', month: 'feb', day: '10' },
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content: '...' } ],
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'18':
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[ { data: { year: '2017', tag: 'two', month: 'feb', day: '18' },
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content: '...' } ] } },
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three:
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{ jan:
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{ '01':
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[ { data: { year: '2017', tag: 'three', month: 'jan', day: '01' },
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content: '...' },
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '01' },
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content: '...' } ],
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'02':
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[ { data: { year: '2017', tag: 'three', month: 'jan', day: '02' },
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content: '...' },
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{ data: { year: '2017', tag: 'three', month: 'jan', day: '02' },
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content: '...' } ] },
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feb:
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{ '01':
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[ { data: { year: '2017', tag: 'three', month: 'feb', day: '01' },
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content: '...' },
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '01' },
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content: '...' } ],
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'02':
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[ { data: { year: '2017', tag: 'three', month: 'feb', day: '02' },
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content: '...' },
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{ data: { year: '2017', tag: 'three', month: 'feb', day: '02' },
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content: '...' } ] } } } }
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```
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## About
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### Related projects
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* [arr-flatten](https://www.npmjs.com/package/arr-flatten): Recursively flatten an array or arrays. This is the fastest implementation of array flatten. | [homepage](https://github.com/jonschlinkert/arr-flatten "Recursively flatten an array or arrays. This is the fastest implementation of array flatten.")
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* [get-value](https://www.npmjs.com/package/get-value): Use property paths (`a.b.c`) to get a nested value from an object. | [homepage](https://github.com/jonschlinkert/get-value "Use property paths (`a.b.c`) to get a nested value from an object.")
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* [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.")
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* [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.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 23 | [doowb](https://github.com/doowb) |
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| 6 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 1 | [cperryk](https://github.com/cperryk) |
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### Building docs
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Brian Woodward**
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* [github/doowb](https://github.com/doowb)
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* [twitter/doowb](https://twitter.com/doowb)
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### License
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Copyright © 2017, [Brian Woodward](https://github.com/doowb).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.4.2, on February 24, 2017._
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