Question

Can anyone please help me read this shorthand code?

datain = $this.hasClass('up')?+1:($this.hasClass('down')?-1:null);

sorry for the obvious question but I can’t work it out myself.

I wish the datain to return “+1” if it has the up class but instead it only returns “1”

Answer 1

The code is using the conditional operator.

if($this.hasClass("up")) {
   datain = 1;
} else {
   if($this.hasClass("down"))
      datain = -1;
   else
      datain = null;
}

If you want datain to return +1, then you probably need to assign it a string instead of an integer. Just wrap the values in quotes. ("+1", "-1")