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JavaScript JavaScript Foundations Variables Null and Undefined

Posted by Tyson Van Buren
Tyson Van Buren
3,692 Points

Help!

The identical() method is being called but the variables are not identical. See if you can fix the code.
<script>

    var myUndefinedVariable;
    var myNullVariable = null;

    if(myNullVariable == myUndefinedVariable) {
        identical();
    }

</script>

I'm having a really hard time solving this problem. Please help!

2 Answers

Laura Cressman
Laura Cressman
12,548 Points
Laura Cressman
Laura Cressman
12,548 Points

Hi Tyson, You just need to add an extra equals sign to the if statement. With just two equals sign, Javascript equates "null" to "undefined," because it considers null to be close enough to undefined. With three equals signs, Javascript will only return true if the two things being compared are exactly the same, not just mostly the same as is what happens when you just put two equal signs. Try this:

Hope that helps! Smile, Laura:)

    var myUndefinedVariable;
        var myNullVariable = null;

        if(myNullVariable === myUndefinedVariable) {
            identical();
        }
Tyson Van Buren
Tyson Van Buren
3,692 Points
Tyson Van Buren
Tyson Van Buren
3,692 Points

Thanks Laura, this really helped me understand what is going on in this problem.

You rock!