Filter null from an array in JavaScript

Question

I have a task to remove false, null, 0, "", undefined, and NaN elements from an given array. I worked on a solution which removes all except null. Anyone can expla

Answer 1

Well, since all of your values are falsy, just do a !! (cast to boolean) check:

[1,"", null, NaN, 2, undefined,4,5,6].filter(x => !!x); //returns [1, 2, 4, 5, 6]

Edit: Apparently the cast isn't needed:

[1,"", null, NaN, 2, undefined,4,5,6].filter(x => x);

And the code above removes null just fine, it's NaN that's the problem. NaN !== NaN as Nina says in her answer.