data.isDefined

This function checks whether the specified mapping reference is defined or not.

Syntax

data.isDefined(mappingReference)

Arguments

Argument	Type	Description
mappingReference	any	Path to activity output or app property. For example: $activity[activityName].propertyName

Returns

Type	Description
boolean	True: if mapping reference is defined False: if mapping reference is not defined

Examples

• If $activity[foo].book[2].price is equal to 30, the function isDefined($activity[foo].book[2].price) returns true.
• If $.foo.store.addr is not defined, the function isDefined($.foo.store.addr) returns false.