IsDefined

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

• IsObject

• IsQuery

• IsSimpleValue

• IsStruct

• IsValid

• IsXML

• IsXmlAttribute

• IsXMLDoc

• IsXMLElem

• IsXMLNode

• IsXMLRoot

• LSIsNumeric

• structIsEmpty