Package ortus.boxlang.runtime.bifs.global.decision

Class IsDefined

java.lang.Object

ortus.boxlang.runtime.bifs.BIF

ortus.boxlang.runtime.bifs.global.decision.IsDefined

@BoxBIF
public class IsDefined
extends BIF

Field Summary

Fields inherited from class ortus.boxlang.runtime.bifs.BIF

__functionName, __isMemberExecution, asyncService, cacheService, componentService, declaredArguments, functionService, interceptorService, moduleService, runtime

Constructor Summary

Constructors

Constructor	Description
IsDefined()	Constructor

Method Summary

Modifier and Type	Method	Description
Object	_invoke(IBoxContext context, ArgumentsScope arguments)	Determine whether a given variable reference exists.

Methods inherited from class ortus.boxlang.runtime.bifs.BIF

announce, getDeclaredArguments, invoke

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

IsDefined

public IsDefined()

Constructor

Method Details

_invoke

public Object _invoke(IBoxContext context,
 ArgumentsScope arguments)

Determine whether a given variable reference exists.

For example:

• isDefined( "luis" ) will test for the existence of an lmajano variable in any accessible scope.
• isDefined( "variables.foo" ) will test for the existence of a foo variable in the variables scope.
• isDefined( "brad.age" ) will test for the existence of an age key in the brad struct, in any accessible scope

Specified by:

_invoke in class BIF

Parameters:

context - The context in which the BIF is being invoked.

arguments - Argument scope for the BIF.

Returns:

The result of the invocation