Type 'boolean' could not convert to 'number' on a comparison

[weakroblox35]

num < num returns a boolean, but for type checking it throws a warning saying that it could not convert to number, why?

local Operation = math.abs(Number - Number2)
return tonumber(Operation) < 5 :: boolean

[intorsetorpolice1 (Kieranl29)]

local Operation = math.abs(Number- Number2)
if tonumber(Operation) <5 then return true else return false end```

[wastbo (DanCodes)]

It’s because you tried to type check the 5 as a boolean instead of the comparison, but you shouldn’t need to because the typechecker already knows that a comparison would return a boolean

[wastbo (DanCodes)]

If you want the function to be type checked you would have to do this:

local function doSomething(): boolean
    return 1 == 1
end

[Orbular3]

Get rid of the tonumber it’s not necessary. It turns the Operation type from number to number?. If you want to keep it you have to first check that tonumber(Operation) is not nil with an if statement.

Also you need brackets around (tonumber(Operation) < 5)

[wastbo (DanCodes)]

Lua doesn’t require brackets around comparisons

[Orbular3]

You do when you’re trying to make it a boolean using ::

[wastbo (DanCodes)]

Yeah but that would be unnecessary, you already pointed out one of the issues

[weakroblox35]

@Orbular3

Also you need brackets around (tonumber(Operation) < 5)

This fixed it, also I know I didn’t need tonumber I just used it to see if it’ll fix it or not.