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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


See Also ...

Lua keywords/topics

assignment
break
comments
data types
do
for (generic)
for (numeric)
function
if / then / else
keywords
local
logical operators
precedence
relational operators
repeat
return
string literals
tables
while

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua LPEG library
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua SQLite (database) interface
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=identifiers)

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