Condense this javascript using ternary operators

Question

I am looking to assign rlPrice to either 0 (if undefined) or to the defined price which would be available. This below will do it ok.

if($('#rl option:selected').data("unit-price") == undefined){
    rlPrice = 0;
else{
    rlPrice = $('#rl option:selected').data("unit-price");
}

However is there a way to do it with ternary operators?

rlPrice = $('#rl option:selected').data("unit-price") OR 0;

score 3 · Accepted Answer · edited May 23 '17 at 12:03

3

Fastest way is to use coalescing operator:

rlPrice = $('#rl option:selected').data("unit-price") || 0;

See this link

edited May 23 '17 at 12:03

Community

answered Nov 04 '13 at 11:02

Teejay

+1 `null coalescing` this is the opt word. Thanks for letting me know this and I like this clean approach. – Praveen Nov 04 '13 at 11:07
Note that the `||` js operator is not perfectly equal to c#'s `??`, see clarifications on the linked page – Teejay Nov 04 '13 at 11:11
@user1671639 you mean `apt` word?? – RAM Nov 04 '13 at 11:11

score 0 · Answer 2 · answered Nov 04 '13 at 11:02

The ternary operator has the form

d = a ? b : c;

Effectively, it means if a is true, then assign b to d, otherwise assign c to d.

So, replacing the real expressions in the above statement:

rlPrice = $('#rl option:selected').data("unit-price") == undefined?0:$('#rl option:selected').data("unit-price")

score 0 · Answer 3 · answered Nov 04 '13 at 11:02

0

Your if..else statement is precised using the ?: opertor.

rlPrice = $('#rl option:selected').data("unit-price") == undefined 
           ? 0 
           : $('#rl option:selected').data("unit-price");

answered Nov 04 '13 at 11:02

Praveen

3 Answers3