array-to-obj

Convert an array of objects into a keyed object

Install

$ npm install array-to-obj

Usage

Default key is id

const arrayToObj = require('array-to-obj');
 
const districts = [
  {id: 1, name: 'Richmond'},
  {id: 2, name: 'Cow Hollow, Marina, Pacific Heights'}
];
 
arrayToObj(districts);
 
// {
//   1: { id: 1, name: 'Richmond' },
//   2: { id: 2, name: 'Cow Hollow, Marina, Pacific Heights' }
// }

Pass a string as a key selector

const arrayToObj = require('array-to-obj');
 
const songs = [
  {title: 'Bluebird', artist: 'One Self'},
  {title: 'Sunshine', artist: 'Atmosphere'}
];
 
arrayToObj(songs, {
  key: 'title'
});
 
// {
//   Bluebird: { title: 'Bluebird', artist: 'One Self' },
//   Sunshine: { title: 'Sunshine', artist: 'Atmosphere' }
// }

Pass a function as a key selector

const arrayToObj = require('array-to-obj');
 
const browsers = [
  {engine: 'Blink', name: 'Chrome'},
  {engine: 'Gecko', name: 'Firefox'}
];
 
arrayToObj(browsers, {
  key: browser => browser.engine.toLowerCase()
});
 
// {
//   blink: { engine: 'Blink', name: 'Chrome' },
//   gecko: { engine: 'Gecko', name: 'Firefox' }
// }

Try/catch in function selector

const arrayToObj = require('array-to-obj');
const shortid = require('shortid');
 
const books = [
  {title: 'The Three-Body Problem', meta: {upc: 9781784971571}},
  {title: 'The Dark Forest'}
];
 
const converted = arrayToObj(books, {
  key: book => {
    try {
      return book.meta.upc;
    } catch (error) {
      return shortid.generate();
    }
  }
});

Pass a function as a key generator

const arrayToObj = require('array-to-obj');
const shortid = require('shortid');
 
const movies = [
  {released: '2001', title: 'Spirited Away'},
  {released: '2004', title: 'Howl\'s Moving Castle'}
];
 
arrayToObj(sourceArray, {
  key: () => shortid.generate()
});
// {
//   qy5Tisvbu: { released: '2001', title: 'Spirited Away' },
//   kYzoS40SOn: { released: '2004', title: 'Howl\'s Moving Castle' }
// }

API

arrayToObj(input, [options])

input

Type: array

An array of objects to convert to an object.

options

Type: Object

key

Type: string or function
Default: 'id'

The property to use as a key. The array index is used when the property is undefined.

License

MIT © Chris Vogt