what is this elixir thing everyone is talking about

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