let's go

Uma introdução sobre a linguagem go no devcamp 2013

Transcript

1. let’s go @andrewsmedina http://andrewsmedina.com let’s go Saturday, May 11, 2013
2. globo .com @andrewsmedina ‣ dev na globo.com ‣ faz parte do time do tsuru paas ‣ contribui com projetos opensource (django, circus, splinter...) ‣ profeta nas horas vagas Saturday, May 11, 2013
3. globo .com por que go? Saturday, May 11, 2013
4. globo .com linguagens estáticas ‣ rápidas ‣ erros a nível de compilação Saturday, May 11, 2013
5. globo .com http://www.thinkgeek.com/product/dac0/ Saturday, May 11, 2013
6. globo .com linguagens estáticas ‣ verbosas ‣ build lento Saturday, May 11, 2013
7. globo .com linguagens dinâmicas ‣ sintaxe agradável Saturday, May 11, 2013
8. globo .com http://media.npr.org/assets/img/2012/08/20/slow-f7c667bbe3c1b9c54cf5061ade96c6799cef281b-s6-c10.jpg Saturday, May 11, 2013
9. globo .com linguagens dinâmicas ‣ lentas ‣ erro em runtime Saturday, May 11, 2013
10. globo .com goals ‣ concorrência ‣ eficiência ‣ fácil ‣ divertida Saturday, May 11, 2013
11. globo .com let’s go Saturday, May 11, 2013
12. globo .com hello world package main import "fmt" func main() { fmt.Println("hello devcamp!") } Saturday, May 11, 2013
13. globo .com hello world 2 - a missão package main import "fmt" func main() { nome := “andrews” fmt.Printf("meu nome é %s\n", nome) } Saturday, May 11, 2013
14. globo .com tipagem (estática) ‣ estática ‣ inferência de tipos Saturday, May 11, 2013
15. globo .com for package main import "fmt" func main() { for i := 0; i <= 10; i++ { fmt.Println(i) } } Saturday, May 11, 2013
16. globo .com primos func ehPrimo(numero int) bool { for i := 2; i < numero; i++ { if numero % i == 0 { return false } } return true } Saturday, May 11, 2013
17. globo .com primos cont.. func main() { numeros := []int{3, 5, 6, 7, 10, 11, 22, 32, 43, 111} for _, numero := range numeros { if ehPrimo(numero) { fmt.Printf("%d é primo.\n", numero) } } } Saturday, May 11, 2013
18. globo .com slices ‣ []type{item1, item2...} ‣ []int{1,2,3} Saturday, May 11, 2013
19. globo .com maps ‣ map[type]type ‣ map[string]string Saturday, May 11, 2013
20. globo .com types type Carro struct { Modelo string } Saturday, May 11, 2013
21. globo .com types c := Carro{Modelo: "Gol"} Saturday, May 11, 2013
22. globo .com methods type Carro struct { Modelo string } func (c *Carro) Acelera() { fmt.Printf("acelerando um %s...\n", c.Modelo) } Saturday, May 11, 2013
23. globo .com methods c := Carro{Modelo: "Gol"} c.Acelera() Saturday, May 11, 2013
24. globo .com interfaces type Aceleravel interface { Acelera() } Saturday, May 11, 2013
25. globo .com interfaces type Moto struct { Modelo string } func (m *Moto) Acelera() { fmt.Printf("vrummmmm\n") } Saturday, May 11, 2013
26. globo .com interfaces func aceleraQualquerCoisa(items []Aceleravel) { for _, aceleravel := range items { aceleravel.Acelera() } } Saturday, May 11, 2013
27. globo .com interfaces c := Carro{Modelo: "Gol"} m := Moto{Modelo: "Harley"} aceleraQualquerCoisa([]Aceleravel{&c, &m}) Saturday, May 11, 2013
28. globo .com concorrência Saturday, May 11, 2013
29. globo .com bebedouro func main() { pessoas := []string{"andrews", "linus", "fowler"} for _, p := range pessoas { pegaAgua(p) go bebeAgua(p) } time.Sleep(1) } Saturday, May 11, 2013
30. globo .com goroutine ‣ “go” Saturday, May 11, 2013
31. globo .com channels func soma(x, y int, c chan int) { c <- x + y } func main() { c := make(chan int) go soma(1, 1, c) go soma(2, 2, c) x, y := <-c, <-c fmt.Println(x+y) } Saturday, May 11, 2013
32. globo .com channels ‣ <- ‣ chan int Saturday, May 11, 2013
33. globo .com baterias incluídas ‣ crypto ‣ encoding ‣ html/template ‣ image ‣ log/syslog ‣ net/http, net/mail, net/smtp Saturday, May 11, 2013
34. globo .com baterias incluídas package main import ( "fmt" "net/http" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, "devcamp 2013") }) http.ListenAndServe("127.0.0.1:3333", nil) } Saturday, May 11, 2013
35. globo .com baterias incluídas package main import ( "os" "text/template" ) func main() { t, _ := template.New("foo").Parse("Hello, {{.}}!") t.Execute(os.Stdout, "devcamp 2013") } Saturday, May 11, 2013
36. globo .com quem já está usando go ‣ google ‣ heroku ‣ mozilla ‣ globo.com ‣ canonical Saturday, May 11, 2013
37. globo .com #comofaz? ‣ http://tour.golang.org/ ‣ http://golang.org/doc/install ‣ http://golang.org/doc/code.html ‣ http://golang.org/doc/effective_go.html Saturday, May 11, 2013
38. let’s go @andrewsmedina http://andrewsmedina.com dúvidas? Saturday, May 11, 2013