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

• IsNumericDate

• IsObject

• IsQuery

• IsSimpleValue

• IsStruct

• IsValid

• IsXML

• IsXmlAttribute

• IsXMLDoc

• IsXMLElem

• IsXMLNode

• IsXMLRoot

• LSIsNumeric

• structIsEmpty