Javascript underscore array to object

Question

Is there an easy/clean way using Underscore to turn this

[ { id: 'medium', votes: 7 },
  { id: 'low',    votes: 9 },
  { id: 'high',   votes: 5 } ]

Into

 { 'low'    : 9,
   'medium' : 7,
   'high'   : 5 }

Answer 1

You might consider _.indexBy(...)

var data = [{
    id: 1,
    name: 'Jon Doe',
    birthdate: '1/1/1991',
    height: '5 11'
}, {
    id: 2,
    name: 'Jane Smith',
    birthdate: '1/1/1981',
    height: '5 6'
}, {
    id: 3,
    name: 'Rockin Joe',
    birthdate: '4/4/1994',
    height: '6 1'
}, {
    id: 4,
    name: 'Jane Blane',
    birthdate: '1/1/1971',
    height: '5 9'
}, ];

var transformed = _.indexBy(data, 'id');

Here is a fiddle: https://jsfiddle.net/4vyLtcrf/3/

Update: In Lodash 4.0.1 the method _.indexBy has been renamed to _.keyBy