Falsy Bouncer help

function bouncer(arr) {
  // Don't show a false ID to this bouncer.
  var x = [false,null,0,"",undefined,NaN];
  arr = arr.filter(function(x){
    return x;
  return arr;

bouncer([7, "ate", "", false, 9]);

I wrote the above code. It works but I don’t know why. Can somebody explain me?

I’ve edited your post for readability. When you enter a code block into the forum, precede it with a line of three backticks and follow it with a line of three backticks to make easier to read. See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.


You say that you wrote it, so how did you expect it to work? What led you to that solution?

1 Like

Since you wrote, you should be able to describe to us what your thought process was (your algorithm) for why it works. Take a shot at explaining it to us and we can correct any misunderstandings you may have.