Go Lang
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Go is a compiled, garbage-collected programming language that supports concurrent programming through lightweight threads called goroutines and communication between goroutines via channels. It aims to provide both high-level and low-level programming with a clean syntax and minimal features. The document discusses Go's concurrency model, syntax, goroutines, channels, and use cases including cloud infrastructure, mobile development, and audio synthesis.
Go Lang
- 2. Programming Model Go concurrency motto: "Do not communicate by sharing memory; instead, share memory by communicating”
- 3. Quick Feature List S Explicit support for concurrent programming. S Compiled S It is strongly typed and garbage-collected. Static typing without too much keyboard typing S High-level code when you want S Low-level code when you want
- 6. Few Syntax
- 7. Demo
- 9. Go supports concurrency S Go provides: S concurrent execution (goroutines) S synchronization and messaging (channels) S multi-way concurrent control (select) S “Lightweight” S Starting 10,000 goroutines on MacBook Pro took 22ms S Allocated memory increased by 3,014,000 bytes (301 bytes per goroutine)
- 10. Goroutines S Goroutines are multiplexed onto OS threads as required. S When a goroutine blocks, that thread blocks but no other goroutine blocks. go foo() go logger.Printf("Hello, %s!", who) go func() { logger.Printf("Hello, %s!", who) ... }()
- 11. Channels Channels are typed values that allow goroutines to synchronize and exchange information. // synchronous chan of ints c := make(chan int) // buffered chan of pointers to Request c := make(chan *Request, 100
- 12. Communication
- 13. Quick syntax review c := make(chan bool)– Makes an unbuffered channel of bools c <- x – Sends a value on the channel <- c – Waits to receive a value on the channel x = <- c – Waits to receive a value and stores it inx x, ok = <- c – Waits to receive a value;okwill be false if channel is closed and empty.
- 14. Multiple goroutines can send on the same channel
- 15. S Go's Concurrency S Built-in! Lightweight threads, no callback hell S Readable, top-down code S So easy to write servers S for { conn, err := listener.Accept() // check err go serve(conn) } S Goroutine-per-request can scale
- 16. Use Cases S Cloud infrastructure S Go: the emerging language of cloud infrastructure S Docker, Packer S CoreOS’s etcd and fleet S Ubuntu Juju, Mozilla Heka, Apcera’s NATS, gnatsd
- 17. S Mobile S Go runs on ARM S minux's iOS port of Go S Camlistore child process, goandroid S Audio synthesis S https://github.com/nf/sigourney
- 18. S Language complexity Java 8 language spec is a 780 page PDF (lol, seriously?). http://docs.oracle.com/javase/sp... Scala language spec is a 191 page PDF. http://www.scala-lang.org/docu/f... The Go language spec is webpage that prints as a 51 page PDF. http://golang.org/ref/spec Defining a language is not the same as learning how to use a language, but it is a proxy for how much there is to learn (or how much there is to confuse you when reading someone else's code).
Editor's Notes
- #19: http://www.quora.com/Go-programming-language/Scala-vs-Go-Could-people-help-compare-contrast-these-on-relative-merits-demerits