What is the ?: syntax in JavaScript? [duplicate]

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
– royhowie, Commented Jul 27, 2015 at 4:35
You are correct, I just saw it in a jquery statement. Thanks Roy — user2381130
– user2381130, Commented Jul 27, 2015 at 4:44

Bhojendra Rauniyar · Accepted Answer · 2015-07-27 04:34:07Z

4

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"

answered Jul 27, 2015 at 4:34

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Comments

Norlihazmey Ghazali · Accepted Answer · 2015-07-27 04:32:42Z

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, 2015 at 4:32

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