Boxlang 1.x Stable Released
BoxLang : A Modern Dynamic JVM Language
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  1. BoxLang Language
  2. Reference
  3. Built-in Functions
  4. decision

IsDefined

PreviousIsDebugModeNextIsEmpty

Last updated 3 months ago

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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

Method Signature

IsDefined(variable=[string])

Arguments

Argument
Type
Required
Description
Default

variable

string

true

The variable reference to test for existence. For security reasons, only dot-notation is supported. Struct/array bracket notation is not supported, nor is function invocation, etc.

Examples

Related

ArrayIsEmpty
Attempt
IsArray
IsBinary
IsBoolean
IsClosure
IsCustomFunction
IsDate
IsDateObject
IsDebugMode
IsEmpty
IsFileObject
IsIPv6
IsJSON
IsLeapYear
IsLocalHost
IsNull
IsNumeric
IsNumericDate
IsObject
IsQuery
IsSimpleValue
IsStruct
IsValid
IsXML
IsXmlAttribute
IsXMLDoc
IsXMLElem
IsXMLNode
IsXMLRoot
LSIsNumeric
structIsEmpty