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This task requires independent learning.

A Scribunto function always returns a string (text) to the Wikipedia page where it is invoked. Lua variables do not have a type, only values have a type. Lua generally tries to convert from one type to another as needed. For example, you can concatenate text with numbers without having to explicitly convert the number to a string first. However, sometimes you have to use the tonumber() function to convert a string to a number.

Lua uses the if <test> then <do-if-true> else <do-if-false> end structure to pick one of two outcomes depending on whether the test gives true or false.

1 In your module sandbox, amend the function "temperature" to supply 0 as the default if no parameter is supplied. Save it.

2 Write a line in your sandbox to test that. Save it.

3 Make changes to the function "temperature" to store the text you are returning in a variable called "msg". Then return msg as the last line before the end of the function. Save it&check in your sandbox that it is still working.

4 Change function "temperature" to test whether the value of "cel" is greater than (>) 9. If it is, then add "It is warm." to "msg", otherwise add "It is cold." - you'll need the concatenation operator (..) and a construction like msg = msg .. " blah blah".

5 Test your function in your sandbox with different values to make sure the test works as expected.