LÖVE

Code: Select all

local Enum = require("enum") -- Require the library

-- Create an enum either with variable amount of variables, or a table holding it.
local Directions = Enum("Up", "Down", "Left", "Right")
local Directions = Enum({"Up", "Down", "Left", "Right"})

-- Access a enum simply with the key.
local myDirection = Directions.Up
local myDirection = Directions["Up"]

-- Perform logic with them
if myDirection == Directions.Up then
   print("Were moving up, boss!")
elseif myDirection == Directions.Down then
   print("Ship is going down!")
end


-- Some nice to knows
local myDirection = Directions.Sideways -- Error: Attempt to index non-existant enum 'Sideways'.
myDirection.foo = "bar" -- Error: "Attempt to write to static enum"

Code: Select all

function table.map(list)
  local map = {}
  for i = 1, #list do
    local v = list[i]
    if map[v] then
      error("duplicate value in list:"..tostring(v))
    end
    map[v] = i
  end
  return map
end