objectify-array

Recursively convert arrays of objects into a single keyed object tree

Installation

npm install objectify-array --save

or

yarn add objectify-array

Usage

const objectifyArray = require('objectify-array')

var people = [
  {id: 'bob', fullName: 'Bob Bobberson'},
  {id: 'sue', fullName: 'Sue Zinn'},
  {id: 'hal', fullName: 'Hal Itosis'}
]

var peopleMap = objectifyArray(people)

This will return an object, using the id property values as keys:

{
  bob: { id: 'bob', fullName: 'Bob Bobberson' },
  sue: { id: 'sue', fullName: 'Sue Zinn' },
  hal: { id: 'hal', fullName: 'Hal Itosis'}
}

id is the default property name to index by. If you want to use another property, specify it as an optional second argument:

var peopleMap = objectifyArray(people, { by: 'myCustomKeyName' })

You can also specify multiple key names as an array, which are tried in the order you provide them. This is most useful when you use the recursive option:

var todos = [
  {
    id: 10,
    description: 'Learn Things',
    tags: [
      { name: 'a', score: 15 }, { name: 'b', score: 83 }
    ]
  },
  {
    id: 20,
    description: 'Do Things',
    tags: [
      { name: 'x', score: 3 }, { name: 'y', score: 9 }
    ]
  },
]
var todosMap = objectifyArray(todos, { by: ['id', 'name'], recursive: true })

todosMap[10] //=> { id: 10, description: ..., tags: ... }
todosMap[20] //=> { id: 10, description: ..., tags: ... }

todosMap[10].tags.a.score //=> 15
todosMap[10].tags.b.score //=> 83

you can specify options.by to be a function, this function will receive the element and should return the key to be used for this element.

var users = [
    { id: 'u', name: 'Alice', hash: 22 }
  ]
var peopleMap = objectifyArray(people, { by: (x) => `${x.id}_${x.hash}` })

peopleMap.u_22.name //=> Alice

For more extensive usage examples, see test.js

API

The module exports a single function:

objectifyArray(array[, options])

• array Array - The array of objects to index.
• options Object (optional) - { by: String | Array<String>, recursive: Boolean }
  • by (default: ['id']) - The key (String) or keys (Array of Strings) to index by.
  • recursive (default: false) - If true, will deeply objectify all arrays in your array of objects.

Tests

npm i && npm t

Dependencies

None

Dev Dependencies

• standard: JavaScript Standard Style
• tap-spec: Formatted TAP output like Mocha's spec reporter
• tape: tap-producing test harness for node and browsers

License

MIT