![Functional
square = fn x -> x*x end
square.(3) => 9
Enum.map(1..5, &(&1 * &1)) => [1, 4, 9, 16, 25]
defmodule MyList do
def map(list, f), do: _map(list, f, [])
defp _map([], _f, ret) do
:lists.reverse(ret)
end
defp _map([head | tail], f, ret) do
_map(tail, f, [f.(head) | ret])
end
end](https://image.slidesharecdn.com/elixirintrod-151023103116-lva1-app6892/85/Elixir-introd-4-320.jpg)
![Pattern Matching
[head | tail] = [1, 2, 3]
{a, b, c} = {:hello, "world", 42}
[a, [b,_,_], c] = [1, [2,3,4], 3]
x = 1; ^x=2](https://image.slidesharecdn.com/elixirintrod-151023103116-lva1-app6892/85/Elixir-introd-5-320.jpg)
Elixir introd
- 1. Elixir Crash Intro dennis 2015.10.23
- 2. What is Elixir? • http://elixir-lang.org/ • Erlang VM + Ruby + Lisp(or clojure?) • Sexy syntax: ruby style, functional • low-latency, distributed and fault-tolerant systems on Erlang VM • Actor Model • Macros ,Protocols and Sigils • More tools such as iex, mix, hex etc.
- 3. https://github.com/elixir-lang/elixir https://github.com/josevalim
- 4. Functional square = fn x -> x*x end square.(3) => 9 Enum.map(1..5, &(&1 * &1)) => [1, 4, 9, 16, 25] defmodule MyList do def map(list, f), do: _map(list, f, []) defp _map([], _f, ret) do :lists.reverse(ret) end defp _map([head | tail], f, ret) do _map(tail, f, [f.(head) | ret]) end end
- 5. Pattern Matching [head | tail] = [1, 2, 3] {a, b, c} = {:hello, "world", 42} [a, [b,_,_], c] = [1, [2,3,4], 3] x = 1; ^x=2
- 6. Actor pid = spawn fn -> 1 + 2 end send self(), {:hello, “world"} receive do {:hello, msg} -> msg {:world, msg} -> "won't match” end
- 7. GenServer
- 8. GenServer • https://gist.github.com/killme2008/7d358688a6a922c1dbab • GenServers are the go-to abstraction for building generic servers in both Elixir and OTP.
- 9. Supervisor • https://gist.github.com/killme2008/ a1ddf2b0fee80f6e137b • A process which supervises other processes called child processes
- 12. Macros • https://gist.github.com/ killme2008/54381ae5f1bb2642d0cf • Custom syntax • DSL
- 13. Protocols • Protocols are a mechanism to achieve polymorphism in Elixir • https://gist.github.com/killme2008/ f192804eee700511642c
- 14. Sigils • "HELLO" =~ ~r/hello/i => true • ~s(this is a string with "double" quotes, not 'single' ones) • ~w(foo bar bat) • https://gist.github.com/killme2008/ d8345301536980d1b64a
- 15. Tools • iex : REPL • mix: Build tool • hex: Package manager • Elixir.ExUnit: Unit Test Framework
- 16. Receipt • K/V Store • http://elixir-lang.org/getting-started/mix-otp/ introduction-to-mix.html • Phoenix Hello World • http://blog.fnil.net/blog/hello/