Re: Closures

[Edgar Toernig <froese@...>]

Jack Christensen wrote:
>
> I'm getting some results I was not expecting with this code.
> 
> functionList = {}
> 
> for i=1, 10 do
>     functionList[ i ] = function()
>         print( i )   
>     end
> end
> 
> for i=1, 10 do
>     functionList[ i ]()
> end
> 
> I get ten 10's printed out. As I understand closures I would have 
> expected 1 to 10.

Why 1 to 10?  You've created ten closures, right.  But alll reference
the same i.  What's the value of i at the time you call the closure?

You get your expected behaviour (freeze the value at closure creation
time) with this:

for i=1, 10 do
    local i=i  -- for each closure a private 'i'
    functionList[ i ] = function()
        print( i )   
    end
end

Ciao, ET.