Sorting an array of Objects - Nodejs

Question

I am trying to sort the following array based on the num in javascript

[ { name: 'sample',
    info: '{"num":10,"type":"detox"}',
    hex: 'bdafa7' },
  { name: 'sample',
    info: '{"num":5,"type":"detox"}',
    hex: 'bdafaj' },
  { name: 'sample',
    info: '{"num":0,"type":"detox"}',
    hex: 'bdafah' },
  { name: 'sample',
    info: '{"num":1,"type":"detox"}',
    hex: 'bdafay' }]

How can I achieve this

Hello! What have you tried so far?

Wrokar
– Wrokar

2018-10-11 23:20:06 +00:00
Commented Oct 11, 2018 at 23:20 — Wrokar
– Wrokar, Commented Oct 11, 2018 at 23:20

Graham P Heath · Accepted Answer · 2018-10-11 23:28:12Z

1

Use a combination of Array.sort and JSON.parse:

let v = [ { name: 'sample',
    info: '{"num":10,"type":"detox"}',
    hex: 'bdafa7' },
  { name: 'sample',
    info: '{"num":5,"type":"detox"}',
    hex: 'bdafaj' },
  { name: 'sample',
    info: '{"num":0,"type":"detox"}',
    hex: 'bdafah' },
  { name: 'sample',
    info: '{"num":1,"type":"detox"}',
    hex: 'bdafay' }];

v.sort((a, b) => {
  return JSON.parse(a.info).num - JSON.parse(b.info).num
});

Returns

[
  {name: "sample", info: "{"num":10,"type":"detox"}", hex: "bdafa7"},
  {name: "sample", info: "{"num":5,"type":"detox"}", hex: "bdafaj"},
  {name: "sample", info: "{"num":1,"type":"detox"}", hex: "bdafay"},
  {name: "sample", info: "{"num":0,"type":"detox"}", hex: "bdafah"}
]

edited Oct 11, 2018 at 23:28

answered Oct 11, 2018 at 23:22

Graham P Heath

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3 Comments

Felix Kling Over a year ago

The sort callback should return a number, not a boolean. JSON.parse(a.info).num - JSON.parse(b.info).num (- instead of <).

Graham P Heath Over a year ago

I wonder how many times I've made that mistake... Thanks Felix Kling.

Nidhi Sharma Over a year ago

That is wonderful !! I was not thinking in this direction that i should have used both array.sort and json.parse.

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