How can I use return in functions?

When you use return, you're essentially storing a value to the function.

For example, typing

return 10

in a function sets the value of that function to 10, so that when you print the function you'll see the number 10 printed.

Take a look at this function.

local function practiceFunction()
    return 15
end

print(practiceFunction())

We returned 15 to the function named practiceFunction, and then we printed practiceFunction, showing 15 in the output.

You can also return strings/text, boolean values like true and false, tables, and other data types.

Returns are useful is you want to get a value out of a function, but not use it right away.

local function add(x,y)
    print(x+y)
end

add(5,7)

Instead of printing 12 directly, we could store 12 into the function using return, letting us use 12 whenever we want to.

local function add(x,y)
    return(x+y)
end

--Many lines later...--

print(add(5,7))

Returns are also used to escape a function if you don't add anything after it.

local number = 6

local function check()
    if 5+number == 12 then
        return
    else
    print("Change your number to 7")
    end
end

check()

If the variable number is 7 then it will return, exiting the function, not running the rest. However, if the variable number isn't 7 then it will print.

function test(w)
    return w
end

local func = test(workspace)


print(func)

you can use it for returning values from a function

Heres an Example.

function xD()
if workspace.FilteringEnabled == true then
return
else
print('WHY ISNT YOUR GAME FE!!??!!?!?!?')
end
end

Return is pretty much an if else statement so,

function test() -- your function you can name it anything
    if part.Transparency == 0 then -- just looking for a variable you can do any property
        print("Transparency = 0")
    return
    else -- if thats not true it will output to this
        print("Transparency test failed")
    end
end