DevGuru WMLScript Operator: typeof

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OPERATOR: typeof

typeof

The typeof operator is used to determine the type of a given expression. An integer is returned that defines the type.

There are five types recognized by WMLScript:

Type	Integer
Integer	0
Floating-point	1
String	2
Boolean	3
Invalid	4

This example tests two expressions; the first is a floating-point number and the second is division by zero which is invalid.

Code for TypeofExample.wml
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.WAPforum.org/DTD/wml_1.1.xml">
<wml>

<card id="card1">
 
 typeof example
 
 <do type="accept">
 <go href="TypeofExample.wmls#findtypeof()" />
 </do>
</card>

<card id="card2">

 1st expression = $(expression1)
 
 1st type = $(typeinteger1)
 
 2cd expression = $(expression2)
 
 2cd type = $(typeinteger2)

</card>

</wml>

Code for TypeofExample.wmls
extern function findtypeof()
{
 var exp1 = 123.456;
 var int1 = typeof(exp1);
 WMLBrowser.setVar("expression1", exp1);
 WMLBrowser.setVar("typeinteger1", int1);
 var exp2 = 1/0;
 var int2 = typeof(exp2);
 WMLBrowser.setVar("expression2", exp2);
 WMLBrowser.setVar("typeinteger2", int2);
 WMLBrowser.go("TypeofExample.wml#card2");
};