Go for the Rubyist

by Dave Grijalva

Transcript

1. Go for the Rubyist Saturday, September 17, 11
2. Dave Grijalva Director of Platform Technology twitter/github: @dgrijalva dave@ngmoco.com Saturday, September 17, 11
3. What is Go? • A new programming language from Google • C-like syntax • Statically compiled • Statically typed • Interface oriented • Concurrent • Garbage collected • Memory safe • Fast Saturday, September 17, 11
4. Multiple Assignment // exchange a and b a, b = b, a // multiple return values file, err := os.Open(“myFile.txt”) // ignore unneeded values string, _ = json.Marshal(myData) Saturday, September 17, 11
5. Types type myInt int type myStruct struct { stuff, things string } type myFuncType func(a string)bool type myStructPtr *myStruct Saturday, September 17, 11
6. Methods // Any type can have methods type MyType int func (i MyType) String()string { return fmt.Sprintf(“%v”, i) } type FooType struct{a, b string} func (f *FooType) String()string { return fmt.Sprintf(“%v foo %v”, f.a, f.b) } Saturday, September 17, 11
7. Interfaces // Declare an interface type MyThingie interface { Foo(string)int } // Implement an interface type MyType struct{a, b string} func (m *MyType) Foo(string)int { // MyType satisfies interface MyThingie return 0 } Saturday, September 17, 11
8. Interfaces // All types satisfy the empty interface var anything interface{} // Lots of things are io.Readers, including os.File and net.Conn var myReader io.Reader myReader, err = os.Open(“myFile.txt”) myReader, err = net.Dial(“google.com:80”) Saturday, September 17, 11
9. Type Assertions // Basic type checking if myThing, ok := someVar.(MyThingie); ok { myThing.Foo(“stuff”) } // Type switches switch myThing := someVar.(type) { case string: fmt.Println(myThing) case MyThinie: myThing.Foo(“stuff”) default: fmt.Println(“I dunno”) } Saturday, September 17, 11
10. Let’s get concurrent Saturday, September 17, 11
11. goroutines // Do something for i := 0; i < n; i++ { DoSomething(i) } // Do something concurrently for i := 0; i < n; i++ { go DoSomething(i) } Saturday, September 17, 11
12. goroutines // Must be a function call, but funcs can be inline go func(){ // go do something }() // Works with methods too go myVar.DoStuff(abc) Saturday, September 17, 11
13. “Don’t communicate by sharing memory. Share memory by communicating.” Saturday, September 17, 11
14. Channels // A typed queue c := make(chan int) // Buffered or unbuffered unbuf := make(chan int) buf := make(chan int, 100) // Send to a chan c <- 1 // Receive from a chan i := <-c Saturday, September 17, 11
15. Select // Receive from multiple chans // Exactly one will succeed select { case i := <-myChanA: fmt.Println(“Received from chan A”, i) case i := <-myChanB: fmt.Println(“Received from chan B”, i) } Saturday, September 17, 11
16. Non-Blocking // Non-blocking receive select { case i := <-myChan: fmt.Println(“Received from chan”, i) default: fmt.Println(“Chan is empty”) } // Non-blocking send select { case myChan <- i: fmt.Println(“Sent to chan”, i) default: fmt.Println(“Chan is full”) } Saturday, September 17, 11
17. Timeouts // Timers send triggers using chans select { case i := <-myChanA: fmt.Println(“Received from chan A”, i) case i := <-time.After(1e9): fmt.Println(“Timeout”) } Saturday, September 17, 11
18. Demo Saturday, September 17, 11
19. Ruby • Ruby 1.9 Fibers • Agent (github.com/igrigorik/agent) • Revactor (revactor.github.com) Saturday, September 17, 11
20. Demo Saturday, September 17, 11
21. ngmoco:) is hiring! ngmoco.com/careers Saturday, September 17, 11
22. Questions? Example code at: github.com/dgrijalva/gogaruco2011 Saturday, September 17, 11