What is the ?: syntax in JavaScript?

Question

what does it mean for the following line?

T = ($("#a .b").hasClass("active") ? "C" : "D") ;

$("#a .b").hasClass("active") means whether #a .b exists? but how about ? "C" : "D", is it some kind of comparison logic?

It's the ternary operator (has nothing to do with jQuery) and is shorthand for an if/else statement — royhowie, Jul 27 '15 at 04:35
You are correct, I just saw it in a jquery statement. Thanks Roy — user2381130, Jul 27 '15 at 04:44

score 4 · Accepted Answer · answered Jul 27 '15 at 04:34

condition ? expr1 : expr2

If condition is true then expr1 would return else expr2 will return.

So, in your case:

T = ($("#a .b").hasClass("active") ? "C" : "D") ;

T variable will hold "C" if $("#a .b") has class active else it would hold "D"

score 1 · Answer 2 · answered Jul 27 '15 at 04:32

1

It tell you that :

if ( $("#a .b").hasClass("active") ) {    
   T = "C";
} else {
   T = "D"
}

Here you can read this doc for further understanding. Ternary Operator

answered Jul 27 '15 at 04:32

2 Answers2