Enemy fishbone

function _M.newEnemy (params)

    local enemy = createEnemySpriteHere
    -- assign properties
    enemy.isAlive = true

    function enemy:init ()
        -- optional initialization function
    end

    function enemy:walk ()
        -- walking here for example
    end

    function enemy:stop ()
        -- stop
    end

    function enemy:hit (damage)
        -- damaging
    end

    function enemy:update ()
        -- whatever
    end

    function enemy:destroy ()
        -- clean up and removal
    end

    return enemy
end

return _M