JavaScript IF ELSE statement in string line

Question

I have JavaScript like this:

var myParam = 1;
var myVar = 'Lorem ipsum dolor [placeholder] amet';

I need to check, if myParam will be 1 then put inline of myVar - one else put there two. Something like this:

var myParam = 1;
var myVar = 'Lorem ipsum dolor '+ if (myParam == 1) return 'one' else return 'two' +' amet';

How to put IF/ELSE statement inside sting?

Please consider using `===` instead of `==`. If you know the type (Number or String) you can safely use `===`. — Halcyon, Oct 22 '13 at 12:00
@FritsvanCampen I want to check if object has propery `value` like this: `myVar = 'some text '+ (typeof Obj.value != 'undefined' ? Obj.value : 'N/A') +' another text';` Which of these should I use `!=` or `!==` ?? — , Oct 22 '13 at 12:07
`typeof` will always return a string, and `'undefined'` is a string, so use `!==`. I have always claimed that there is never a valid reason to use `==` (or `!=`), if you know of one I'd love to hear about it :) — Halcyon, Oct 22 '13 at 12:08
@FritsvanCampen and what is the difference? is there any matter of performance? — , Oct 22 '13 at 12:11
Yes, but I don't believe performance is the main reason, see: http://stackoverflow.com/questions/359494/does-it-matter-which-equals-operator-vs-i-use-in-javascript-comparisons — Halcyon, Oct 22 '13 at 12:12

score 5 · Accepted Answer · answered Oct 22 '13 at 11:59

5

Use a ternary expression:

var myVar = 'Lorem ipsum dolor ' + (myParam == 1 ? 'one' : 'two') +' amet';

answered Oct 22 '13 at 11:59

Rory McCrossan

Praveen · Answer 2 · 2013-10-22T12:06:04.860

1

You can use ternary operator, where ?: operator can be used as a shortcut for an if...else statement.

Syntax: test ? expression1 : expression2

like

(myParam == 1) ?'one' : 'two'

edited Oct 22 '13 at 12:06

answered Oct 22 '13 at 11:59

Praveen

score 0 · Answer 3 · answered Oct 22 '13 at 11:59

0

(myParam == 1) ? true : false;

You might want to think about === - or myParam could be 1, or "1", to use a basic example.

answered Oct 22 '13 at 11:59

SpaceBison

Claudio Santos · Answer 4 · 2013-10-22T12:13:53.440

-1

Using Ternary operator:

<condition> ? true: false

'Lorem ipsum dolor '+ ((myParam == 1) ? 'one' : 'two') +' amet';

edited Oct 22 '13 at 12:13

answered Oct 22 '13 at 11:59

Claudio Santos

4 Answers4