Sort an array so that null values always come last

Question

I need to sort an array of strings, but I need it so that null is always last. For example, the array:

var arr = [a, b, null, d, null]

When

Answer 1

Ascending

arr.sort((a, b) => (a != null ? a : Infinity) - (b != null ? b : Infinity))

Descending

arr.sort((a, b) => (b != null ? b : -Infinity) - (a != null ? a : -Infinity))

(For descending order if you don't have negative values in the array, I recommend to use 0 instead of -Infinity)