How to sort strings in JavaScript

Question

I have a list of objects I wish to sort based on a field attr of type string. I tried using -

list.sort(function (a, b) {
    retur         


        

Answer 1

Answer (in Modern ECMAScript)

list.sort((a, b) => (a.attr > b.attr) - (a.attr < b.attr))

Or

list.sort((a, b) => +(a.attr > b.attr) || -(a.attr < b.attr))

Description

Casting a boolean value to a number yields the following:

• true -> 1
• false -> 0

Consider three possible patterns:

• x is larger than y: (x > y) - (y < x) -> 1 - 0 -> 1
• x is equal to y: (x > y) - (y < x) -> 0 - 0 -> 0
• x is smaller than y: (x > y) - (y < x) -> 0 - 1 -> -1

(Alternative)

• x is larger than y: +(x > y) || -(x < y) -> 1 || 0 -> 1
• x is equal to y: +(x > y) || -(x < y) -> 0 || 0 -> 0
• x is smaller than y: +(x > y) || -(x < y) -> 0 || -1 -> -1

So these logics are equivalent to typical sort comparator functions.

if (x == y) {
    return 0;
}
return x > y ? 1 : -1;