Comments are pieces of text or whitespace that can be included in a program to make the code more understandable to a programmer. Comments have no effect on the running program and are ignored by the lua interpreter.
Comments start with a doublehyphen[edit | edit source]
In lua, comments start with a doublehyphen and run until the end of the line:
-- This is a comment print "Hello World!"
Block comments[edit | edit source]
--[[Comments can be spread across several lines ]] print "Hello World!"
Enabled code within comments[edit | edit source]
---[[The long handled doubleshovel means that this code will run print "This will print because it is not a comment!" -- We can still include comments by prefixing them with a doubledash -- print "This will not print because it is commented out" ]]
Nested comments[edit | edit source]
A limitation of block style comments is that it is not possible to nest existing code containing comments without stripping the doubleshovel and doubleclosebox symbols from the nested code:
--[[ This will not work. Nesting of comment blocks will cause a syntax error. --[[ By nesting existing code containing a comment, a syntax error will occur. This is because the nested symbols will confuse the interpreter, so a modification is required to remove the symbols ]] print "Hello" ]]
The code needs modification as follows:
--[[ The nested comment block markers have been removed @ This existing comment has had its block markers removed to prevent a syntax error @ print "Hello" ]]