Re: Question about local functions inside functions.

[Tom N Harris <telliamed@...>]

On 4/18/2016 10:11 AM, Ulrich Schmidt wrote:
> I know. The background of my question was: I like to hide functions inside functions hided inside functions.
> This helps me to make excessive use of code folding in ZBS and keeps things as local as possible.

That's what do-end blocks are for.

> But i was not sure, it slows down something.

Starting in Lua 5.2, a closure that does not have any upvalues will be 
cached and reused.

    function noclosure(x)
        a = x
        return function()
            return a
        end
    end

    function withclosure(x)
        local a = x
        return function()
            return a
        end
    end

    print(noclosure(1) == noclosure(2))
    -- true
    print(withclosure(1) == withclosure(2))
    -- false

-- tom
<telliamed@whoopdedo.org>