nil (value)

In the Lua language, the value nil is special and is to mean false, or the equivalent of a NULL pointer in the C language. The value nil is designed to be different from any other possible value.

Usage

• Setting a table or variable equal to nil to cause Lua to delete it from use and collect its memory usage.
• Returned values can be tested for equality to nil.
• Lua returns nil for variables, functions, etc. that do not exist.

Related Topics

true, false