To put it simply, your code demonstrates the usage of...

To put it simply, your code demonstrates the usage of a module script and how to call a function from it using a server script. However, there are a few issues in your implementation. I'll explain step-by-step and point out what your code does and if there are any errors.

What does this code do?

1. The moduleScript module:

   • You create a simple module script that has a single function, add(a, b), which takes two numbers as arguments, adds them, and returns the result.

   local module = {}
   function module.add(a, b)
     local result = a + b
     return result
   end
   return module
   

   • This script defines a module table, assigns the add function to it, and then returns the module at the end of the file. This is a typical Roblox module script.

2. The server script:

   • The server script tries to:
     1. Access a moduleScript placed under ReplicatedStorage in the game's hierarchy.
     2. Use WaitForChild to find the moduleScript.
     3. Use the require function to load the module.
     4. Call the add(4, 6) function from the module.

Issues in your implementation:

1. Incorrect module script location:

   • The module script should be stored in ReplicatedStorage if you need to access it from the server script. Ensure you've placed the module script named moduleScript in the correct place in the hierarchy.

2. Forgetfulness in handling require:

   • The server script tries to require(module), which is correct and will work only if you correctly reference your moduleScript in ReplicatedStorage.

3. No printing or handling of the result:

   • You're calling module.add(4, 6) in your server script, which correctly computes the sum of 4 and 6 (i.e., 10), but you're not doing anything with the output. If you want to see the result, you must store it in a variable or print it out.

   Example fix:

   local result = moduleTable.add(4, 6)
   print(result)  -- This will output: 10
   

4. Unclear reference to the mentioned "output 10" in the comment:

   • The code doesn't explicitly print 10 anywhere. If you're relying on seeing 10 in the output, you need to explicitly add a print() statement in the server script.

Fixed and Complete Code Example

Here’s the full corrected code for both the moduleScript and the server script:

Module Script:

-- moduleScript
local module = {}

function module.add(a, b)
    local result = a + b
    return result
end

return module

Server Script:

-- Server Script
local RS = game:GetService("ReplicatedStorage")
local module = RS:WaitForChild("moduleScript")  -- Ensure moduleScript is in ReplicatedStorage
local moduleTable = require(module)  -- Load the module

local result = moduleTable.add(4, 6)  -- Call the add function
print(result)  -- Output: 10

Conclusion

• If written and used correctly with the moduleScript stored in ReplicatedStorage, this code will compute the sum of 4 and 6, outputting 10 in the console.
• However, your original code didn't include a print() statement, so nothing would actually appear in the output window unless explicitly handled.