Sort array of objects by the length of a field using lodash

Question

I have an array like below, and I need to sort the array by the string length of name field. for an example,

[
  {
    "_id": 10,
    "name": "AAAAAA"
  },
  {
    "_id": 11,
    "name": "AA"
  },
  {
    "_id": 12,
    "name": "AAAA"
  },
  {
    "_id": 13,
    "name": "A"
  },
  {
    "_id": 14,
    "name": "AAAAAAAA"
  }
]

I need the array like this,

[
  {
    "_id": 13,
    "name": "A"
  },
  {
    "_id": 11,
    "name": "AA"
  },
  {
    "_id": 12,
    "name": "AAAA"
  },
  {
    "_id": 10,
    "name": "AAAAAA"
  },
  {
    "_id": 14,
    "name": "AAAAAAAA"
  }
]

can any one help me out with this. Thanks.

`array.sort((a, b) => a.name.length - b.name.length)` – adiga Sep 14 '21 at 13:48 — adiga, Sep 14 '21 at 13:48

Mr. Polywhirl · Answer 1 · 2021-09-15T13:06:42.217

This can be accomplished with the _.orderBy method:

_.orderBy(data, [({ name }) => name.length, 'name'], ['desc']);

Here is a break-down:

I threw some "B"s into the mix to show the secondary sorting (after length is compared). Sorting the length alone is not unique enough.

const data = [
  { "_id":  1, "name": "AAAAAA"   },
  { "_id":  2, "name": "AA"       },
  { "_id":  3, "name": "AAAA"     },
  { "_id":  4, "name": "A"        }, 
  { "_id":  5, "name": "AAAAAAAA" },
  { "_id":  6, "name": "BBBBBB"   },
  { "_id":  7, "name": "BB"       },
  { "_id":  8, "name": "BBBB"     },
  { "_id":  9, "name": "B"        }, 
  { "_id": 10, "name": "BBBBBBBB" }
];

const sorted = _.orderBy(
  data,                               // Data to be sorted
  [
    ({ name: { length } }) => length, // First, sort by length
    'name'                            // Them sort lexicographically
  ], [
    'desc',                           // Length (descending)
    'asc'                             // This is implied, and could be removed
  ]
);

console.log(sorted);

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Sort array of objects by the length of a field using lodash

1 Answers1