Yo.utils.undef

Use this function to test whether an object is undefined.

Prerequisites

The following command to load the appropriate version of the Rapid+JS Library must precede the use of this function on the page. Specify your own site key:

<script src="https://rapid-cdn.yottaa.com/rapid/lib/sitekey.js"></script>

Syntax

Yo.utils.undef(object)

Returns

True if the object is not defined. False if the object is defined.

Parameters

Parameter	Description
object	Specifies the object whose existence will be tested.

Example

The first statement in this example tests whether parameter1 is undefined. It is, so the function returns true. The next statement defines parameter1 as a variable and sets its value to 'bob'. The last statement tests whether parameter1 is undefined, and returns false.

Yo.utils.undef(parameter1);
var parameter1 = 'bob';
Yo.utils.undef(parameter1);