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

I am sorting objects with a custom index and this works for me. I am not wanting to change the original array and it is important to keep the null indexes where they are.

let sorted = [...array].sort((a, b) => {
               if (!a || !b) return 0;
               else return a.CustomIndex - b.CustomIndex;
             });

Answer 2

Do it like:

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

        foreach ($arr as $key => $value) {
           if($value == null)
           unset($arr[$key]);
           $arr[] = $value;

        }
        // rebuild array index
        $arr = array_values($arr);

        echo '<pre>';print_r($arr);die;