power of erlang joy of ruby

Presenter: Dave Thomas

Bio

This is a training session @ 2013 Lone Star Ruby Conference

Abstract

• introduction of elixir: Ruby-like formatted functional language

Summary

Memorable Quotes

• If you don't keep up with what's going on, you will eventually get out of date.
• The future is functional, the future is concurrent.

Notes

Syntax for Exilir is a lot like Ruby, with different meaning..

defmodule Sequence do

  def hello do
    IO.puts "hello"
  end

  # This is equivalent in Exilir
  def hello, do: IO.puts "Hello"
end

Sequence.hello

Functional language is all about pattern-matching

defmodule Sequence do
  def len([]), do: 0
  def len([head | tail]), do: 1 + len(tail)
end

Demonstration of Fibonacci numbers

defmodule Sequence do
  def fib(0), do: 1
  def fib(1), do: 1
  def fib(n), do: fib(n-1) + fib(n-2)
end

IO.puts Sequence.fib(20)

def map([], fun), do: []
def map([head|tail], fun), do: [fun.(head) | map(tail, )]

Define test framework

Extest.start
defmodule TestIt do
  use Extest
  import Sequence

  test "basic fib function works" do
    assert fib(10) == 89
  end
end

External Links

• Some related website