identifiers

Identifiers in Lua can be any string of letters, digits, and underscores, not beginning with a digit, of any length. For example:

a   b   monster    abc876    _foo   a_variable_with_a_long_name

You should avoid using identifiers starting with an underscore followed by upper-case letters, as these are reserved for Lua variables such as _VERSION.

Lua is case-sensitive, so foo and FOO are different identifiers.

Identifiers cannot be reserved words, these words are reserved:

• and
• break
• do
• else
• elseif
• end
• false
• for
• function
• if
• in
• local
• nil
• not
• or
• repeat
• return
• then
• true
• until
• while