CODEWITHSUNDEEP
javascriptfunctional-programminglodash
jack ho
jack ho

Reputation: 19

How to pick elements by array from array of object

I have an array of object, and I want to remove some elements like this.

var data = [{a:1, b:2, c:3, d:4}, {a:11, b:22, c:33, d:44}]
var saveByKeys = ['a', 'c']

The result I want is:

var reuslt = [{a:1, c:3}, {a:11, c:33}]

How to use lodash to do that? One-line would be better

Upvotes: 0

Views: 175

Answers (2)

Akrion
Akrion

Reputation: 18515

If you want to avoid lodash this is how this would look like with ES6:

var data = [{a:1, b:2, c:3, d:4}, {a:11, b:22, c:33, d:44}]
var keys = ['a', 'c']

const pick = (obj, keys) => keys.reduce((r,c) => (r[c] = obj[c], r),{})
console.log(data.map(x => pick(x, keys)))

Upvotes: 0

Ori Drori
Ori Drori

Reputation: 191976

You can use lodash's _.pick() with Array.map() (or lodash's _.map()):

const data = [{a:1, b:2, c:3, d:4}, {a:11, b:22, c:33, d:44}]
const saveByKeys = ['a', 'c']

const result = data.map(o => _.pick(o, saveByKeys))

console.log(result)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

Upvotes: 1

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