LÖVE

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local gameStates = {}

gameStates.menu = {
	update = function( dt )  --[[<...>]]  end,
	draw = function()  --[[<...>]]  end,
}
gameStates.gameLoop = {
	update = function( dt )  --[[<...>]]  end,
	draw = function()  --[[<...>]]  end,
}

local state
function setState( state )
    state = gameStates[state]
end

function love.load()
    setState"menu"
end
function love.update( dt )
    state.update( dt )
end

function love.draw()
    state.draw()
end

local keys = {
    left = function()  setState"menu",
    right = function()  setState"gameLoop",
}

function love.keypressed( k )
    local action = keys[k]
    if action then  return action()  end
end

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strsub (s, i, [j])

Returns another string, which is a substring of s , starting at i and runing until j . If j is absent, it is assumed to be equal to the length of s . Particularly, the call strsub(s,1,j) returns a prefix of s with length j , while the call strsub(s,i) returns a suffix of s , starting at i .

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a = strsub("Hello, this is a test",0,5)
print(a) = "Hello"

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function explode(div,str) -- credit: http://richard.warburton.it
  if (div=='') then return false end
  local pos,arr = 0,{}
  -- for each divider found
  for st,sp in function() return string.find(str,div,pos,true) end do
    table.insert(arr,string.sub(str,pos,st-1)) -- Attach chars left of current divider
    pos = sp + 1 -- Jump past current divider
  end
  table.insert(arr,string.sub(str,pos)) -- Attach chars right of last divider
  return arr
end