Sort map by value where map is an array in JavaScript

Question

I'm trying to sort a map by value where the values are arrays.

For example the map below:

{'let1': ['art', 'can'], 'let2': ['own', 'kit', 'dig'], 'let3': ['art', 'zero']}

I would like to sort it as:

{'let1': ['art', 'can'], 'let3': ['art', 'zero'], 'let2': ['own', 'kit', 'dig']}

Is it possible using the JavaScript sort() method?

What are you actually trying to achieve? Can you show us a bigger picture? It might be an XY problem — Sebastian Kaczmarek
– Sebastian Kaczmarek, Commented Aug 3, 2020 at 19:16

Mr. Polywhirl · Accepted Answer · 2020-08-03 19:22:09Z

3

Sorting of an object is not advised. It should be treated as a look-up. You should convert the key-value pairs to entry tuples and sort the value at index 1 (aka the value array).

See: Sorting object property by values

let obj = {
  'let1': ['art', 'can'],
  'let2': ['own', 'kit', 'dig'],
  'let3': ['art', 'zero']
};

console.log(Object.entries(obj).sort((a, b) =>
  a[1].join(',').localeCompare(b[1].join(','))));

.as-console-wrapper { top: 0; max-height: 100% !important; }

Result

[
  [ "let1", [ "art", "can"        ] ],
  [ "let3", [ "art", "zero"       ] ],
  [ "let2", [ "own", "kit", "dig" ] ]
]

answered Aug 3, 2020 at 19:22

Mr. Polywhirl

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