Javascript shorhand syntax

Question

What does this mean?

var min = minimum ? minimum : 15;

Encountered in the following context:

 tempApp.filter('minimum', [ function() {
return function(arrTemp, minimum) {
var arrReturn = new Array();
var min = minimum ? minimum : 15;
angular.forEach(arrTemp, function(value, key){
if(value.temp>=min) arrReturn.push(value);
});
return arrReturn;
}
}]);

and [javascript ? : notation](http://stackoverflow.com/q/3322704/218196) — Felix Kling, Feb 24 '14 at 00:05
and many of those: [`[javascript] "?" ":" meaning`](https://stackoverflow.com/search?q=[javascript]+%22%3F%22+%22%3A%22+meaning) — Felix Kling, Feb 24 '14 at 00:06
Or just do `var min = minimum || 15`. But careful with zero... — elclanrs, Feb 24 '14 at 00:06

score 1 · Accepted Answer · answered Feb 24 '14 at 00:10

1

It is a shorthand version of

if(minimum) {
  min = minimum;
} else {
  min = 15;
}

answered Feb 24 '14 at 00:10

Tims

1,987
14
16

htatche · Answer 2 · 2014-02-24T00:27:56.973

0

if(minimum) {
  min = minimum;
} else {
  min = 15;
}

edited Feb 24 '14 at 00:27

answered Feb 24 '14 at 00:04

htatche

693
3
17

2

That's not even correct. If `minimum` is `"foo"`, then `mininum == true` is `false`, but is still considered true-ish in `var min = minimum ? minimum : 15;` (because non-empty strings evaluated to `true`). – Felix Kling Feb 24 '14 at 00:08
You are right, I just wanted to show the concept of `true-ish` to OP, but you are right. – htatche Feb 24 '14 at 00:27

Javascript shorhand syntax

2 Answers2