Check if value is defined, then use it in if statement

[Harshdeep S Jawanda]

What's the best/correct way to check (in template code) if the value for a particular variable has been defined (in the passed-in list of parameters), and if it has been defined then take either ActionA or ActionB based on that value?

For example, I want to write the equivalent of this pseudo-code:

if (variableZ.isDefined()) {

    if (variableZ) {

        ActionA;

    } else {

        ActionB;
    }
}

For simplicity I am assuming that variableZ is a boolean.

--
Regards,
Harshdeep S Jawanda

[green]

There is no argument can be undefined. Even if you didn't pass them in the params. Let's say you have `@args boolean b`, if you failed to pass value for argument `b`, then it will be in `false` the default value. If your argument is type Object, then the default value is null.

So your case could be simplified as:

@if(variableZ) {

   ActionA

} else {

   ActionB

}

Please refer more about variable evaluation at http://rythmengine.org/doc/directive.md#if

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