#include <AutoItConstants.au3>
#include <MsgBoxConstants.au3>
Example()
Func  Example()
; Check if a variable is the Default keyword.
Local $vDefault= Default
If  IsDefault($vDefault)Then
MsgBox ($MB_SYSTEMMODAL,"","The variable is the Default keyword")
Else
MsgBox ($MB_SYSTEMMODAL,"","The variable is not the Default keyword")
EndIf
; Check if a variable is the Null keyword.
Local $vNull= Null
If  IsNull($vNull)Then
MsgBox ($MB_SYSTEMMODAL,"","The variable is the Null keyword")
Else
MsgBox ($MB_SYSTEMMODAL,"","The variable is not the Null keyword")
EndIf
; Check if a variable is the Null keyword. This will be false as $sString is a string datatype.
Local $sString= 'Default'
If  IsDefault($sString)Then
MsgBox ($MB_SYSTEMMODAL,"","The variable is the Default keyword")
Else
MsgBox ($MB_SYSTEMMODAL,"","The variable is not the Default keyword")
EndIf
EndFunc ;==>Example
Func  IsDefault($vKeyword)
Return IsKeyword ($vKeyword)= $KEYWORD_DEFAULT
EndFunc ;==>IsDefault
Func  IsNull($vKeyword)
Return IsKeyword ($vKeyword)= $KEYWORD_NULL
EndFunc ;==>IsNull