CODEWITHSUNDEEP
javascript
Atal Shrivastava
Atal Shrivastava

Reputation: 692

What is the use of "?" in jquery

What is the use of "?" mark ? can anyone explain what question mark is doing here.

0 ? 1 : 1+w

and also ":" symbol . How to use "?" while writing the codes..

I have seen so many codes where people will use "?" like example above.

can anyone explain what question mark is doing.

Upvotes: 0

Views: 205

Answers (4)

MReis
MReis

Reputation: 56

The expression is a tenerary operator. It works like an 'if' and 'else'. Whatever is before the '?' is evaluated, returning what is after the '?' when the condition is true, and whatever is after the ':' if it is false.

These expressions give the same results:

a = 0 ? 1 : 1+w

if(0){
    a = 1;
}else{
    a = 1 + w;
}

Upvotes: 0

Ritesh A
Ritesh A

Reputation: 283

That's called ternary operator, a kind of conditional operator

var fooNotNull = (foo !== null) ? true : false;

if the first condition is 'true', it is saved in the variable 'fooNotNull', else the second value 'false' is stored in 'footNotNull'

Upvotes: 0

rajesh kakawat
rajesh kakawat

Reputation: 10896

It has nothing to do with jquery. it is javascript if else shorthand method

Check below example

var big;
if (x > 10) {
    big = true;
}
else {
    big = false;
}

shorthand

var big = (x > 10) ? true : false;

Upvotes: 1

duncan
duncan

Reputation: 31912

This is nothing to do with jquery, this is standard javascript. It's known as a ternary operator. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator

This: 

x = a ? b : c

is the equivalent of writing:

if (a) {
  x = b 
} else {
  x = c
}

Upvotes: 3

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