Javascript Ternary operator with empty else

Question

I\'m trying to convert the following if-else to it\'s ternary operator representation in javascript as follows

var x = 2;
if (x === 2) {alert(\"2\");}
else
          


        

Answer 1

Do this :

(t==2)?(alert("1")):null;

You could replace null by any expression that has no side effect. () is not a valid expression.

Answer 2

You putted a lot of useless parentheses, and the best NULL value in js is undefined.

document.getElementById('btn-ok').onclick = function(){
  var val = document.getElementById('txt-val').value;
  
  val == 2 ? alert(val) : undefined;
}

<input id="txt-val" type="number" />
<button type="button" id="btn-ok">Ok</button>

using a single line if statement is better though

if(value === 2) alert(value);

Answer 3

NO, you can't have empty else, better don't use the ternary operator, it requires a third argument. Go with simple if condition.

if(t==2) alert("2");

Answer 4

Answer to your real question in the comments:

all2.forEach(function (e) {
    e.getAttribute("class") && only.push(e.getAttribute("class"));
});

Answer 5

I don't like it's either. So you're on the right track looking for alternatives.

In this case, I would write:

t===2 && alert("2")

Your idea is valid too, for instance you can do this:

t===2 ? alert("2") : null

But it's four extra chars.

Answer 6

In that case you don't need to use Ternary operator. Ternary operator requires a third argument.

condition ? expr1 : expr2

Lokki at Conditional (ternary) Operator

You can use the if statement

if ( t == 2 ) alert(1);