JS code from challenge

Question

Hello Guys,
I'm not sure about this code.
Can someone explain me why the output is "x" please?

<script>
(function(x) {
return(function(y) {alert(x);
}) ();
})("x")
</script>

Answer 1

This is probably one of the most interesting concept in Javascript and once you fully understand it you'll become the master! Try Google:-

Javascript Closure

to study more about it. 😉

Answer 2

You're welcome Babihac! 😄

Answer 3

Thank you for the worthwhile advice. I will check it soon :D