This code is not working because your syntax is invalid.
You cannot end a line with a ,. You need to use a ;.
You should only declare your function once, with the arguments a and b.
I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.