lua first step 2

lua_firstep.lua

local firstname = "lionel"
local display = print

display(firstname)

--table as associative array
local person = {
  firstname = "lilil",
  developer = true,
  score = 150000,
  loose = function(self, nb)
    self.score = self.score - nb
  end
}

person.sayHello = function()
  display("hello "..person.firstname.." score: "..person.score)
end
--syntactic sugar for person.loose(person, 125000)
person:loose(125000)

person.sayHello()

--unidimensional array
local a = {7,12,4}
--iterate
for idx, value in ipairs(a) do
  print(idx, value)
end

--a function can return several values
local function connect()
  --simulate error
  return nil, "unable to connect to..."
end

local db, err = connect()
if not db then
  print("oups..."..err)
end