local p = {};     --All lua modules on Wikipedia must begin by defining a variable 

                    --that will hold their externally accessible functions.

                    --Such variables can have whatever name you want and may 

                    --also contain various data as well as functions.

p.hello = function( frame )     --Add a function to "p".  

                                        --Such functions are callable in Wikipedia

                                        --via the #invoke command.

                                        --"frame" will contain the data that Wikipedia

                                        --sends this function when it runs. 

                                 -- 'Hello' is a name of your choice. The same name needs to be referred to when the module is used.

    

    local str = "Hello World!"  --Declare a local variable and set it equal to

                                --"Hello World!".  

    

    return str    --This tells us to quit this function and send the information in

                  --"str" back to Wikipedia.

    

end  -- end of the function "hello"

function p.header(frame)		-- Add another function

	local name = frame.args1  -- To access arguments passed to a module, use `frame.args`

							    -- `frame.args[1]` refers to the first unnamed parameter

							    -- given to the module

	return "<h1>" .. name .. ".</h1>"  -- `..` concatenates strings. This will return a customized

									 -- greeting depending on the name given, such as "Hello, Fred!"

end

function p.count_fruit(frame)

	local num_bananas = frame.args.bananas -- Named arguments ({{#invoke:Example|count_fruit|foo=bar}}) are likewise 

	local num_apples = frame.args.apples   -- accessed by indexing `frame.args` by name (`frame.args["bananas"]`, or)

										   -- equivalently `frame.args.bananas`.

	return 'I have ' .. num_bananas .. ' bananas and ' .. num_apples .. ' apples'

										   -- Like above, concatenate a bunch of strings together to produce

										   -- a sentence based on the arguments given.

end



return p    --All modules end by returning the variable containing their functions to Wikipedia.

-- Now we can use this module by calling {{#invoke: Example | hello }},

-- {{#invoke: Example | hello_to | foo }}, or {{#invoke:Example|count_fruit|bananas=5|apples=6}}

-- Note that the first part of the invoke is the name of the Module's wikipage,

-- and the second part is the name of one of the functions attached to the 

-- variable that you returned.



-- The "print" function is not allowed in Wikipedia.  All output is accomplished

-- via strings "returned" to Wikipedia.