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.hello_to(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 "Hello, " .. name .. "!"  -- `..` 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 = tonumber(frame.args.bananas) or 0	-- Named arguments ({{#invoke:Example|count_fruit|foo=bar}})

	local num_apples = tonumber(frame.args.apples) or 0		-- are likewise accessed by indexing `frame.args` by name (`frame.args["bananas"]`,

															--  or equivalently `frame.args.bananas`.

															

	local conj_bananas = num_bananas == 1 and 'banana' or 'bananas'

    local conj_apples = num_apples == 1 and 'apple' or 'apples'

    										-- Ternary operators assign values based on a condition in a compact way.

											-- Here, `conj_bananas` gets `'banana'` if `num_bananas` is 1, else `'bananas'`.

											-- Similarly, `conj_apples` gets `'apple'` if `num_apples` is 1, else `'apples'`.

    

    return 'I have ' .. num_bananas ..  ' ' .. conj_bananas .. ' and ' .. num_apples .. ' ' .. conj_apples														

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

										   -- a sentence based on the arguments given.

end



local function lucky(a, b) -- One can define custom functions for use. Here we define a function 'lucky' that has two inputs a and b. The names are of your choice.

	if b == 'yeah' then -- Condition: if b is the string 'yeah'. Strings require quotes. Remember to include 'then'.

		return a .. ' is my lucky number.' -- Outputs 'a is my lucky number.' if the above condition is met. The string concatenation operator is denoted by 2 dots.

	else -- If no conditions are met, i.e. if b is anything else, output specified on the next line.  'else' should not have 'then'.

		return a -- Simply output a.

	end -- The 'if' section should end with 'end'.

end -- As should 'function'.



function p.Name2(frame)

	-- The next five lines are mostly for convenience only and can be used as is for your module. The output conditions start on line 50.

	local pf = frame:getParent().args -- This line allows template parameters to be used in this code easily. The equal sign is used to define variables. 'pf' can be replaced with a word of your choice.

	local f = frame.args -- This line allows parameters from {{#invoke:}} to be used easily. 'f' can be replaced with a word of your choice.

	local M = f1 or pf1 -- f[1] and pf[1], which we just defined, refer to the first parameter. This line shortens them as 'M' for convenience. You could use the original variable names.

	local m = f2 or pf2 -- Second shortened as 'm'.

	local l = f.lucky or pf.lucky -- A named parameter 'lucky' is shortend as l. Note that the syntax is different from unnamed parameters.

	if m == nil then -- If the second parameter is not used.

		return 'Lonely' -- Outputs the string 'Lonely' if the first condition is met.

	elseif M > m then -- If the first condition is not met, this line tests a second condition: if M is greater than m.

		return lucky(M - m, l) -- If the condition is met, the difference is calculated and passed to the self defined function along with l. The output depends on whether l is set to 'yeah'.

	else

		return 'Be positive!'

	end

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.