String compare when using new String() in Javascript

Question

Sometimes I need to make sure that a variable is a String. I used to do that by using the operator new String(value).

However, when I do that, the comparison doesn't work. For example:

var dude = new String("dude");
var dude2 = new String("dude");
console.log(dude == dude2); //will print 'false'

How to make string comparison when using the "new String()"?

I'm using JS as in the Google Apps Script

Harold · Accepted Answer · 2014-02-23 10:48:18Z

1

you can do that:

dude.toString() == dude2.toString()

answered Feb 23, 2014 at 10:48

Harold

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1 Comment

That's a good workaround. But still, why can't we compare two variables when we used the new String(value) to define them?

Trevor Hsu · Accepted Answer · 2018-03-07 09:10:33Z

1

This is the reason why 'dude' and 'dude2' are unequal:

var dude = new String("dude");
var dude2 = new String("dude");

console.log(typeof dude)    //object
console.log(typeof dude2)   //object

you can do it like this:

 var dude = String('dude');
 var dude2 = String('dude');
 dude === dude2  //true

answered Mar 7, 2018 at 9:10

Trevor Hsu

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