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what is this elixir thing everyone is talking about
José Tomás Albornoz
September 16, 2016
Programming
0
99
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
José Tomás Albornoz
September 16, 2016
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Transcript
what is this elixir thing everyone's talking about by jojo
what is elixir
elixir is a functional language
created by José Valim
that runs on the erlang vm
pattern matching iex(1)> [first, second] = [1, 2] [1, 2]
iex(2)> first 1
pattern matching iex(2)> [first, second] = [1,2,3] ** (MatchError) no
match of right hand side value: [1, 2, 3]
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"
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
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
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
pipe operator def add_one(number), do: number + 1 def multiply_by_three(number),
do: number * 3 multiply_by_three(add_one(1)) # => 6
pipe operator def add_one(number), do: number + 1 def multiply_by_three(number),
do: number * 3 1 |> add_one |> multiply_by_three # => 6
processes + messages current_process = self() spawn_link(fn -> send(current_process, {:msg,
"hello world"}) end) receive do {:msg, contents} -> IO.puts contents end
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)
what is phoenix
A productive web framework that does not compromise speed and
maintainability.
it's basically rails for elixir, but cooler
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
we're hiring!
@eljojo