JavaScript -- Function Basics

Question

In the following get function: If parent && parent.parentNode is true and the return value is parent.parentNode.selectedIndex -- will the function return null at the end, too?

get: function( elem ) {
    var parent = elem.parentNode;
    if ( parent && parent.parentNode ) {
        parent.parentNode.selectedIndex;
    }
    return null;
}

It will always return null, you're not telling it do anything else — StudioTime
– StudioTime, Commented Apr 1, 2016 at 6:09
You are not returning anything except null. You need return parent.parentNode.selectedIndex; inside the function. And then it will return null only if your condition fails. — AKS
– AKS, Commented Apr 1, 2016 at 6:09

Ramon-san · Accepted Answer · 2016-04-01 06:43:49Z

1

You need to use a return statement within the if statement. Return statements in JavaScript return control back to the parent function immediately. So if function 1 calls function 2, as soon as function 2 comes to a return statement, it stops what it's doing and passes control, and data if specified, back to function 1.

get: function( elem ) {
    var parent = elem.parentNode;
    if ( parent && parent.parentNode ) {
        return parent.parentNode.selectedIndex;
    }
    return null;
}

edited Apr 1, 2016 at 6:43

Ramon-san

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answered Apr 1, 2016 at 6:14

Euroclydon37

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Comments

Vighnesh Patel · Accepted Answer · 2016-04-01 06:29:16Z

0

If you want to return only a value

If parent && parent.parentNode is true

or return null

If parent && parent.parentNode is false

then write the below code

get: function( elem ) {
    var parent = elem.parentNode;
    if ( parent && parent.parentNode ) {
        return parent.parentNode.selectedIndex;
    }
    else{
        return null;
    }
}

answered Apr 1, 2016 at 6:29

Vighnesh Patel

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