Re: Select (Switch) Case statement

[Eric Tetz <erictetz@...>]

Asko Kauppi wrote:
> But it wouldn't hurt, either.

Well, it *would* make the language bigger -- without adding anything that can't
already be done just as easily and efficiently via if-elseif-else.

If they're going to be adding any major syntactical elements to Lua, I want
infix binary operators. ;)



Michael Roth wrote:
>   local case, default = switch(i)
>
>   if case(2) then
>     print("two")
>   end

I don't understand how that is preferable to:

  if i == 2 then
   print("two")
  end



Mark Hamburg wrote:
> The problem with that version is that it builds the switch table every time.

YASS (Yet Another Switch Statement):

  function switch(n, ...)
    for i=1,arg.n do
      if n == arg[i][1] then
        arg[i][2]()
        break
      end
    end
  end

  function case(n,f)
    return {n,f}
  end


  ...


  switch( action,

     case( DOG_BARK, function()
       print("Arf!!!")
       end), 

     case( DOG_BITE, function()
       print("Chomp!")
       end),

     case( DOG_SLEEP, function()
       print("Zzzzzz...")
       end)
  )