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Programação Funcional & Elixir
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Amanda
November 04, 2017
Technology
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Programação Funcional & Elixir
Amanda
November 04, 2017
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Transcript
Programação Funcional & Elixir
@amandasposito @amsposito @amandasposito
None
Falando um pouco de história
http://www.gotw.ca/publications/concurrency-ddj.htm
None
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“Efficiency and performance optimization will get more, not less, important.”
“Applications will increasingly need to be concurrent if they want
to fully exploit continuing exponential CPU throughput gains.”
Por que isso afeta nossa aplicação?
None
Elixir criada por José Valim
Percebeu que as ferramentas que existiam não eram boas para
concorrência
None
Elixir roda em cima da maquina virtual do Erlang
Erlang é conhecido por rodar aplicações com latência baixa, distribuídas
ou tolerante a falhas
Escalabilidade Tolerância a falhas Compatível com Erlang Hot Code Swap
Linguagem Dinâmica Metaprogramação Polimorfismo Concorrência
Diferentes paradigmas
Paradigma Funcional
–Introduction to Functional Programming - Richard Bird Philip Wadler “Programming
in a functional language consists of building definitions and using the computer to evaluate expressions.”
Imutabilidade
Consistência de dados
Concorrência Capacidade de lidar com várias coisas ao mesmo tempo
https://blog.whatsapp.com/196/1-million-is-so-2011?
Vamos resolver um problema
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switch = fn (bulb) -> ... end switch.(bulb)
defmodule LightBulb do def switch(human, bulb) do end end LightBulb.switch(bulb)
Pattern Matching
name = "Amanda"
Interactive Elixir (1.5.2) - press Ctrl+C to exit (type h()
ENTER for help) iex(1)> name = "Amanda" "Amanda" iex(2)> "Amanda" = name "Amanda" iex(3)> "Amanda S" = name ** (MatchError) no match of right hand side value: "Amanda"
defmodule LightBulb do def switch(human = %Human{}, bulb = %Bulb{})
… end end
Function Arity
defmodule LightBulb do def switch(human, bulb) do ... end def
switch(_) do IO.puts "Precisamos de um humano e de uma escada." end end
Guards
defmodule LightBulb do def switch(human, bulb) when bulb.burned_out == true
do … end end
If and unless
defmodule LightBulb do def switch(human, bulb) when bulb.burned_out == true
do ladder = Ladder.get_average_height() if ladder.under do … end end end
Pipe Operator
new_bulb = Bulb.get_bulb() lader = Ladder.get_average_height() human = Human.climb(human, ladder)
human = Human.remove_bulb(human, bulb) human = Human.put_bulb(human, new_bulb)
Ladder.get_average_height() |> Human.climb(human) |> Human.remove_bulb(bulb) |> Human.put_bulb(new_bulb)
None
Recursão
numbers = 3; for(i = numbers; i > 0; i--)
{ console.log(i); }
None
defmodule NaturalNums do # Uma clausula para parar a recursão
def print(1), do: IO.puts(1) def print(n) do # Imprime o número" IO.puts(n) # Chama a si mesmo com um valor a menos print(n - 1) end end
iex(1)> NaturalNums.print(3) 3 2 1 :ok
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https://www.codeschool.com/courses/try-elixir
https://www.dailydrip.com/topics/elixir https://github.com/dailydrip/firestorm
http://plataformatec.com.br/elixir-radar
None
Obrigada!
Referências • https://hipsters.tech/elixir-a-linguagem-hipster- hipsters-48/ • https://codewords.recurse.com/issues/one/an- introduction-to-functional-programming • http://theerlangelist.blogspot.com.br/2013/05/working- with-immutable-data.html