scalar bool array string 0xe0ffffef
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If variables don't exist, their value as string is generally a "scalar bool array string 0xe0ffffef" error.
Compatibility:
Version ArmA: Armed Assault 1.00
Note
Operation Flashpoint: For Operation Flashpoint version, see scalar bool array string 0xfcffffef.
Examples:
hint format ["%1", undefined_variable]
hint (if (format ["%1", undefined_variable] == "scalar bool array string 0xe0ffffef") then { "Variable undefined" } else { "Variable already defined" })