Remove Whitespace-only Array Elements

Question

Since using array.splice modifies the array in-place, how can I remove all whitespace-only elements from an array without throwing an error? With PHP we have preg_grep but I

Answer 1

a="remove white spaces"

a.split(' ').join('').split('');

It returns an array of all characters in {a="remove white spaces"} with no 'space' character.

You can test the output separately for each method: split() and join().