Go(lang) for the Rubyist
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This document discusses the Go programming language. It provides an overview of Go including that it is compiled, statically typed, garbage collected, cross-platform, concurrent and has simple syntax. It also discusses Go features like packages, testing, concurrency, web development, databases and when Go may be a good choice for a project.
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Go(lang) for the Rubyist
- 1. @markbates
- 2. @markbates
- 9. #WTF??
- 10. “Art isn’t created in a vacuum.”
- 12. pol·y·glot (pŏl′ē-glŏt′)! adj. Speaking, writing, written in, or composed of several languages. n. 1. A person having a speaking, reading, or writing knowledge of several languages. 2. A book, especially a Bible, containing several versions of the same text in different languages. 3. A mixture or confusion of languages.
- 14. What is Go?
- 16. pro-tip: golang
- 17. 40% of the Internet http://www.forbes.com/sites/timworstall/2013/08/17/fascinating-number-google-is-now-40-of-the-internet/
- 18. compiled
- 19. statically typed
- 21. cross platform
- 22. concurrent
- 23. simple
- 24. 25 keywords
- 25. no exceptions
- 26. Basics
- 27. package main! ! import "fmt"! ! func main() {! fmt.Println("Hello, World!")! }
- 28. Concurrency
- 29. package main! ! func LiftHeavyStuff() {! // do heavy lifting! }! ! func main() {! LiftHeavyStuff()! }
- 30. package main! ! func LiftHeavyStuff() {! // do heavy lifting! }! ! func main() {! go LiftHeavyStuff()! }
- 31. package main! ! import "fmt"! ! func main() {! ! ! ! ! ! ! comm := make(chan string)! go func() {! ! // do heavy lifting! ! comm <- "Done heave lifting"! }()! ! ! fmt.Println(<-comm)! }
- 32. Speed
- 33. package main! ! import "fmt"! ! func fibonacci() func() int {! ! x := 0! ! y := 1! ! return func() int {! ! ! x, y = y, x+y! ! ! return x! ! }! }! ! func main() {! ! f := fibonacci()! ! for i := 0; i < 10; i++ {! ! ! fmt.Println(f())! ! }! }
- 34. def fibonacci(n)! return n if n <= 1! fibonacci(n - 1) + fibonacci(n - 2)! end! ! puts fibonacci( 10 )
- 35. $ go build $ time ./fib real 0m0.005s user 0m0.001s sys 0m0.003s $ time ruby fib.rb real 0m0.038s user 0m0.029s sys 0m0.007s
- 36. Duck Typing?
- 37. package main! import "fmt"! type Bar struct {! z string! }! ! ! type Greeter interface {! SayHello()! }! func (b Bar) SayHello() {! fmt.Println("[Bar] Hello!")! }! ! ! func Talk(g Greeter) {! g.SayHello()! }! func main() {! foo := Foo{}! Talk(foo)! bar := Bar{}! Talk(bar)! } ! ! type Foo struct {! x int! }! ! func (f Foo) SayHello() {! fmt.Println("[Foo] Hello!")! }
- 39. go get
- 41. Testing
- 42. package calculator! ! import "testing"! ! func TestAdd(t *testing.T) {! aresult := Add(1, 2)! if aresult != 3 {! t.Errorf("Expected %d, Actual %d", 3, aresult)! }! }
- 44. package calculator_test! ! import (! . "calculator"! . "github.com/onsi/ginkgo"! . "github.com/onsi/gomega"! )! ! var _ = Describe("Calculator", func() {! Describe("Add", func() {! It("Adds two numbers together", func() {! Expect(Add(1, 2)).To(Equal(3))! })! })! })
- 45. Web
- 46. package main! ! import (! "fmt"! "net/http"! )! ! func handler(w http.ResponseWriter, r *http.Request) {! fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])! }! ! func main() {! http.HandleFunc("/", handler)! http.ListenAndServe(":8080", nil)! }
- 48. package main! ! import "github.com/codegangsta/martini"! ! func main() {! m := martini.Classic()! m.Get("/", func() string {! return "Hello world!"! })! m.Run()! }
- 49. Database
- 51. SQLX - https://github.com/jmoiron/sqlx GORP - https://github.com/coopernurse/gorp JET - https://github.com/eaigner/jet
- 52. Workers
- 54. Assets
- 55. Lineman.js :)
- 56. When to Use Go
- 57. cli
- 58. concurrency #ftw
- 59. speed
- 61. shell out to ruby