a switch in Lua

switch.lua

-- fct to simulate a switch
function switch(t)
  t.case = function (self,x)
    local f=self[x] or self.default
    if f then
      if type(f)=="function" then
        f(x,self)
      else
        error("case "..tostring(x).." not a function")
      end
    end
  end
  return t
end

usage

a = switch {
  [1] = function (x) print(x,10) end,
  [2] = function (x) print(x,20) end,
  default = function (x) print(x,0) end,
}

a:case(2)  -- ie. call case 2 
a:case(9)

found here: http://lua-users.org/wiki/SwitchStatement