Downloaded 17 times
![func main() {!
attendees := map[string]bool{!
"Phil": true,!
"Marcin": true,!
}!
!
fmt.Println(attendees["Phil"]) // true!
fmt.Println(attendees["ags"]) // false!
partygoers["ags"] = true!
fmt.Println(attendees["ags"]) // true!
}!](https://image.slidesharecdn.com/golang-140918162945-phpapp01/85/Go-the-one-language-to-learn-in-2014-30-320.jpg)
![[18:48][agrzesik@melmac:~/vcs/talks/go/hello]!
$ find .!
.!
./bin!
./bin/main!
./pkg!
./pkg/darwin_amd64!
./pkg/darwin_amd64/hello.a!
./src!
./src/hello!
./src/hello/hello.go!
./src/main!
./src/main/.main.go.swp!
./src/main/main.go!](https://image.slidesharecdn.com/golang-140918162945-phpapp01/85/Go-the-one-language-to-learn-in-2014-58-320.jpg)
![type AssetMetas struct {!
! Metas []AssetMeta `json:"assetMetas"`!
}!
!
type AssetMeta struct {!
! ResourceName string `json:"resource_name"`!
! Md5 string `json:"md5"`!
! Urls []string `json:"urls"`!
}!](https://image.slidesharecdn.com/golang-140918162945-phpapp01/85/Go-the-one-language-to-learn-in-2014-70-320.jpg)
Uploaded byAndrzej Grzesik
Go, the one language to learn in 2014
This document provides an overview of the Go programming language. It highlights some of Go's key features like being fast, having no runtime dependencies, easy packaging and distribution of code, built-in concurrency with goroutines and channels, and a simple but powerful type system. It also provides examples of basic Go constructs like functions, maps, structs, interfaces, goroutines, channels, and web servers to illustrate how to write Go programs.
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Similar to Go, the one language to learn in 2014
Go, the one language to learn in 2014
- 1. golang the onelanguage you have to try in 2014
- 2. golang the onelanguage you have to try in 2014
- 3. Andrzej Grzesik ! ! ! @ags313 andrzej@grzesik.it andrzejgrzesik.info
- 4.
- 5.
- 6.
- 7. my opinions aremy own
- 8.
- 9.
- 10.
- 11.
- 12. free and opensource
- 13.
- 14.
- 15. FAST and Imean FAST
- 16. tl;dr; C++ andruby had a wild time
- 17. play with ittonight
- 18. so, why doI like go?
- 19.
- 20.
- 21.
- 22.
- 23.
- 24. there is onlyone formatting
- 25. package main! ! import "fmt"! ! func main() {! !fmt.Println("Hello world")! }!
- 26.
- 27. types • uint8,uint16, uint32, uint64 • int8, int16, int32, int64 • float32, float64 • complex64, complex128 • byte alias for uint8 • rune alias for int32 • string
- 28. func program() {! var text! text = “zomg"! more := "zomg"! ! fmt.Println(len(text));! }!
- 29.
- 30. func main() {! attendees := map[string]bool{! "Phil": true,! "Marcin": true,! }! ! fmt.Println(attendees["Phil"]) // true! fmt.Println(attendees["ags"]) // false! partygoers["ags"] = true! fmt.Println(attendees["ags"]) // true! }!
- 31.
- 32. type Rectangle struct{! a, b int32! }! ! func main() {! var rect Rectangle! rect = Rectangle{5, 10}! rect = Rectangle{a: 10, b: 5}! ! HasArea(s).Area()! }
- 33. type Square struct{! side int32! }! ! func (sq Square) Area() int32 {! return sq.side * sq.side! }! ! func main() {! s := Square{16}! area := s.Area()! }
- 34.
- 35. type Square struct{! side int32! }! ! func (sq Square) Area() int32 {! return sq.side * sq.side! }! ! type HasArea interface {! Area() int32! }! ! func main() {! s := Square{16}! HasArea(s).Area()! }
- 36.
- 37. func f(i int){! amt := rand.Intn(1000)! time.Sleep(time.Duration(amt) * time.Millisecond)! fmt.Println(i)! }! ! func main() {! for i := 0; i < 3; i++ {! go f(i)! }! var input string! fmt.Scanln(&input)! }
- 38. how many willrun? runtime.GOMAXPROCS(4)
- 39.
- 40. channels • communicatebetween funcs • typed • thread-safe
- 41. channels channel :=make(chan int)!
- 42. unbuffered channels •sync • will wait when empty
- 43. buffered channels channel:= make(chan int, size)!
- 44. buffered channels •async • return 0 element when empty • will only wait when full
- 45. basics channel :=make(chan int)! c <- a! ! <- c! ! a = <- c! ! a, ok = <- c!
- 46. func program() {! channel := make(chan int) ! }! ! func from(connection chan int) {! connection <- rand.Intn(255)! }! ! func to(connection chan int) {! i := <- connection! fmt.Println(“much received", i)! }!
- 47. but that’s notcool yet
- 48.
- 49. func program() {! channel := make(chan int) ! ! go func() {! close(channel)! // or! channel <- anything! }()! ! <- channel! }!
- 50. func program() {! latch := make(chan int) ! ! go worker()! close(latch)! }! ! func worker() {! <- latch ! }!
- 51.
- 52. id := make(chanint64)! go func() {! var counter int64 = 0! for {! id <- counter! counter += 1! } ! }()
- 53. multiple channels atonce!
- 54. func program() {! select {! case a := <- channel! ! case b, mkay := other! ! case output <- z! ! default:! }! }!
- 55.
- 56. func fillIn(channel chanint) {! channel <- 1! channel <- 2! channel <- 4! close(channel)! }! ! func main() {! channel := make(chan int)! go fillIn(channel)! ! for s := range channel {! fmt.Printf("%d n", s)! }! }
- 57.
- 58. [18:48][agrzesik@melmac:~/vcs/talks/go/hello]! $ find.! .! ./bin! ./bin/main! ./pkg! ./pkg/darwin_amd64! ./pkg/darwin_amd64/hello.a! ./src! ./src/hello! ./src/hello/hello.go! ./src/main! ./src/main/.main.go.swp! ./src/main/main.go!
- 59. import (! "code.google.com/p/go.net/websocket"! "fmt"! "net/http"! )!
- 60.
- 61.
- 62.
- 63. const listenAddr ="localhost:4000"! ! func main() {! l, err := net.Listen("tcp", listenAddr)! if err != nil {! log.Fatal(err)! }! for {! c, err := l.Accept()! if err != nil {! log.Fatal(err)! }! io.Copy(c, c)! }! }
- 64.
- 65. const listenAddr ="localhost:4000"! ! func main() {! l, err := net.Listen("tcp", listenAddr)! if err != nil {! log.Fatal(err)! }! for {! c, err := l.Accept()! if err != nil {! log.Fatal(err)! }! go io.Copy(c, c)! }! }
- 66. const listenAddr ="localhost:4000"! ! func main() {! l, err := net.Listen("tcp", listenAddr)! if err != nil {! log.Fatal(err)! }! for {! c, err := l.Accept()! if err != nil {! log.Fatal(err)! }! io.Copy(c, c)! }! }
- 67.
- 68. func main() {! http.Handle("/", websocket.Handler(handler))! http.ListenAndServe("localhost:1984", nil)! }! ! func handler(c *websocket.Conn) {! var s string! fmt.Fscan(c, &s)! fmt.Println("Received:", s)! fmt.Fprint(c, “hey!”)! }!
- 69. so, what looksbad?
- 70. type AssetMetas struct{! ! Metas []AssetMeta `json:"assetMetas"`! }! ! type AssetMeta struct {! ! ResourceName string `json:"resource_name"`! ! Md5 string `json:"md5"`! ! Urls []string `json:"urls"`! }!
- 71.