MoonScript, a programmer friendly language that compiles to Lua(moonscript.org)

    http://github.com/antirez/load81.git

    -- LuaJIT
    
    local oldG = _G
    local newG = setmetatable({}, {
        __index = oldG,
    })
    setmetatable(oldG, {
        __index = function(t, k)
            return rawget(newG, k)
        end,
        __newindex = function()
            error('attempt to assign global variable')
        end,
    })
    _G = newG

  (b-a)%(c-a)+a

  (b-a)%(c-a+1)+a

  n % array.length

  (n % #array) + 1

    function f(a, b, c, d)
        a = a or 1
        b = b or 2
        c = c or 3
        d = d or 4
    end

    Object = {}
    function Object:new()
        local self = setmetatable({}, {__index = self})
        return self
    end

    local super = Object
    Shape = Object.new(super)
    function Shape:new(color)
        local self = super.new(self)
        self.color = color
        return self
    end

    local super = Shape
    RedShape = Object.new(super)
    function RedShape:new()
        local self = super.new(self, 0xff0000)
        return self
    end