Question

I have an array like this:

arr = []
arr[0] = "ab"
arr[1] = "abcdefgh"
arr[2] = "abcd"

After sorting, the output array should be:

arr[0] = "abcdefgh"
arr[1] = "abcd"
arr[2] = "ab"  

I want in the descending order of the length of each element.

Answer 1

You can use Array.sort method to sort the array. The callback function should use the length of item as the sorting criteria:

// sort ascending - shorter items first
arr.sort((a, b) => a.length - b.length);

// sort descending - longer items first
arr.sort((a, b) => b.length - a.length);

You can specify additional criteria if length of two items are same:

// sort by length
// if equal then sort by dictionary order
["c", "a", "b"].sort((a, b) => a.length - b.length || a.localeCompare(b));