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">
<p>
typeof example
</p>
<do type="accept">
<go href="TypeofExample.wmls#findtypeof()"
/>
</do>
</card>
<card id="card2">
<p>
1st expression = $(expression1)
<br />
1st type = $(typeinteger1)
<br />
2cd expression = $(expression2)
<br />
2cd type = $(typeinteger2)
</p>
</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");
};
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