lua.md

LUA

The short way

Contributed by: Dautomne_

This is the way everyone in the Programmer Nullposting group says is the best.

function isEven(num)
  return num % 2 == 0
end

The OOP way

Contributed by: daillen

OOP is the best, right?

IsEven = {}

function IsEven:new(number)
  local obj = { number = number }
  setmetatable(obj, self)
  self.__index = self
  return obj
end

function IsEven:check()
  return self.number % 2 == 0
end

isEven = IsEven:new(10)
print(isEven:check())

The time-arithmetic way

Contributed by: fcr--

Converts n*30 from a unix timestamp to a table where one of the fields is the number of seconds. Unixtime famously started at 1970-01-01 00:00:00, so then n*30 has 0 seconds if even or 30 seconds when odd.

function iseven(n)
   return os.date('!*t', n*30).sec == 0
end

The syntax error way

Contributed by: fcr--

Only an even number of consecutive backslashes are accepted in strings.

function iseven(n)
   return nil~=load('_="'..('\\'):rep(n)..'"')
end