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
– Halcyon, Commented Oct 22, 2013 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 !== ?? — user2893747
– user2893747, Commented Oct 22, 2013 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
– Halcyon, Commented Oct 22, 2013 at 12:08
@FritsvanCampen and what is the difference? is there any matter of performance? — user2893747
– user2893747, Commented Oct 22, 2013 at 12:11
Yes, but I don't believe performance is the main reason, see: stackoverflow.com/questions/359494/… — Halcyon
– Halcyon, Commented Oct 22, 2013 at 12:12

Rory McCrossan · Accepted Answer · 2013-10-22 11:59:05Z

5

Use a ternary expression:

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

answered Oct 22, 2013 at 11:59

Rory McCrossan

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Praveen · Accepted Answer · 2013-10-22 12:06:04Z

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, 2013 at 12:06

answered Oct 22, 2013 at 11:59

Praveen

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Comments

csharpnumpty · Accepted Answer · 2013-10-22 11:59:15Z

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, 2013 at 11:59

csharpnumpty

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Claudio Santos · Accepted Answer · 2013-10-22 12:13:53Z

-1

Using Ternary operator:

<condition> ? true: false

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

edited Oct 22, 2013 at 12:13

answered Oct 22, 2013 at 11:59

Claudio Santos

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