what is this elixir thing everyone is talking about

some of my fav features of elixir

lightning talk for CodeDaze.io on September 16th, 2016

Transcript

1. what is this elixir thing everyone's talking about by jojo
2. what is elixir
3. elixir is a functional language
4. created by José Valim
5. that runs on the erlang vm
6. pattern matching iex(1)> [first, second] = [1, 2] [1, 2] iex(2)> first 1
7. pattern matching iex(2)> [first, second] = [1,2,3] ** (MatchError) no match of right hand side value: [1, 2, 3]
8. pattern matching iex(1)> payload = %{username: "eljojo", stuff: true} %{stuff: true, username: "eljojo"} iex(2)> %{username: name} = payload %{stuff: true, username: "eljojo"} iex(3)> name "eljojo"
9. function overloading def make_sound(:cow) do IO.puts "MOOOOOOOOO" end def make_sound(:cat) do IO.puts "MEEEOOWW" end def make_sound(_) do IO.puts "¯\_(ϑ)_/¯" end
10. function overloading def make_sound(%{animal: :cow}) do IO.puts "MOOOOOOOOO" end def make_sound(%{animal: :cat}) do IO.puts "MEEEOOWW" end def make_sound(%{animal: name}) do IO.puts "not sure how to #{name} ¯\_(ϑ)_/¯" end
11. we also got guards def page_ops(downtime) when downtime < 10 do IO.puts "¯\_(ϑ)_/¯" end def page_ops(downtime) when downtime >= 10 do PagerDuty.notify(whatever) end
12. pipe operator def add_one(number), do: number + 1 def multiply_by_three(number), do: number * 3 multiply_by_three(add_one(1)) # => 6
13. pipe operator def add_one(number), do: number + 1 def multiply_by_three(number), do: number * 3 1 |> add_one |> multiply_by_three # => 6
14. processes + messages current_process = self() spawn_link(fn -> send(current_process, {:msg, "hello world"}) end) receive do {:msg, contents} -> IO.puts contents end
15. processes + messages # machine one receive do {:msg, contents} -> IO.puts contents end # machine two process_name = "$MACHINE_ONE" spawn_link(fn -> send(process_name, {:msg, "yo!"}) end)
16. what is phoenix
17. A productive web framework that does not compromise speed and maintainability.
18. it's basically rails for elixir, but cooler
19. validations def changeset(struct, params \\ %{}) do struct |> cast(params, [:email_address, :first_name]) |> validate_required([:email_address]) end def changeset_after_signup(struct, params \\ %{}) do changeset(struct, params) |> validate_required([:first_name]) end
20. we're hiring!
21. @eljojo