Array.sort().filter(…) with zero in Javascript

Question

Why 0 is not returned by the following filter ?

[0, 5, 4].sort().filter(function(i){return i}) // returns : [4, 5]

Answer 1

0 is considered a falsy value.

Your filter function is essentially returning false for 0 and filtering it from the array.

Check this out for a deeper look.