Blag's bag of rants: LED is my new Hello World

jueves, 18 de junio de 2015

LED is my new Hello World - Lua Time

Getting on with my tradition of building an LED application for each and every new programming language that I learn...it's time for Lua -;)

LedNumbers.lua
local function split(s,delim) local result = {} for match in (s..delim):gmatch("(.-)"..delim) do table.insert(result,match) end return result end leds = {[0] = " _ ,\| \| ,\|_\| ", [1] = " ,\| ,\| ", [2] = " _ , _\| ,\|_ ", [3] = "_ ,_\| ,_\| ", [4] = " ,\|_\| , \| ", [5] = " _ ,\|_ , _\| ", [6] = " _ ,\|_ ,\|_\| ", [7] = "_ , \| , \| ", [8] = " _ ,\|_\| ,\|_\| ", [9] = " _ ,\|_\| , _\| "} io.write("Enter a number: ") num = io.read() for i = 1,3 do for j = 1, #num do line=split(leds[tonumber(string.sub(num,j,j))],",") io.write(line[i]) end print("") end

LedNumbers.lua

local function split(s,delim)
 local result = {}
 for match in (s..delim):gmatch("(.-)"..delim) do
  table.insert(result,match)
 end
 return result
end

leds = {[0] = " _  ,| | ,|_| ",
        [1] = "  ,| ,| ",
        [2] = " _  , _| ,|_  ",
        [3] = "_  ,_| ,_| ",
        [4] = "    ,|_| ,  | ",
        [5] = " _  ,|_  , _| ",
        [6] = " _  ,|_  ,|_| ",
        [7] = "_   , |  , |  ",
        [8] = " _  ,|_| ,|_| ",
        [9] = " _  ,|_| , _| "}

io.write("Enter a number: ")
num = io.read()
for i = 1,3 do
 for j = 1, #num do
  line=split(leds[tonumber(string.sub(num,j,j))],",")
  io.write(line[i])
 end
 print("")
end

What you can see right away...and that's something that really surprised me...is that Lua doesn't provide a "split" or "explode" command out of the box, so you need to make it yourself...actually...the same holds true for Haskell...but for me...functional languages are on another league...and anyway...Haskell's implementation of the split function is way shorter...

Here's the result...

Greetings,

Blag.
Development Culture.

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