Introduction to go, and why it's awesome
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https://golang.org/ * golang tutorial - https://tour.golang.org/ * golang playground - https://play.golang.org/ * Go GitHub repo https://github.com/golang/go * Kubernetes GitHub repo https://github.com/kubernetes/kubernetes * Demo a simple web server - https://gist.github.com/janetkuo/063d667861a67a05ae4ea8779c501036
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Introduction to go, and why it's awesome
- 1. Introduction to Go AND WHY IT’S AWESOME
- 2. About me SWE at Google Open source Kubernetes written in Go https://github.com/kubernetes/kubernetes
- 3. Today you’ll learn What is Go? Why Go? Basic Syntax Features
- 4. A little background about Go...
- 5. History Started at Google Released, open-sourced in 2009 New, modern 20161945 C 1972 Python 1991 Java JavaScript 1995 Go 2009 https://golang.org/
- 6. Why Go? Google internal needs ★ Efficient large scale programming ★ Distributed systems ★ Speed of compilation ★ Multicore, networked hardware http://xkcd.com/
- 7. Go is… Fast compilation time Concurrent Garbage-collected Modern with support for networked and multi-core computing General-purpose Compiled Statically typed like C, Java Feels as easy, lightweight as JS, Python
- 8. Design Principles Simplicity concepts easy to understand Orthogonality concepts mix cleanly Readability comprehensible with little context
- 11. Hello World
- 12. Functions
- 13. Object-oriented?
- 14. Yes and no... Composition over inheritance ★ No type hierarchy ★ No class ★ No generics
- 15. Simple Type System Statically typed, with type inference
- 16. Types and methods You can define methods on any type I mean ANY
- 17. Interfaces An interface type defines a set of methods
- 18. More on Go features
- 19. Concurrency UNIX: processes connected by pipes $ find ~/go/src/pkg | grep _test.go$ | xargs wc -l Go: goroutines connected by channels, concurrency made easy to use
- 21. Concurrency: channels Channels are a typed pipe for ★ Synchronization ★ Communication
- 22. Concurrency philosophy The efficiency of an asynchronous model written in a synchronous style Connect goroutines with channels -- simpler, maintainable code
- 23. Tooling gofmt reformats code goimports updates import lines golint prints style mistakes godoc documentation of packages and symbols go vet vets the package go get download and install packages and dependencies go test automates testing the packages no more tabs vs. spaces! no more “import not used”, or “import not found”
- 24. Rich library support Comprehensive standard library 150+ packages Many great external libraries 120, 000+ packages https://godoc.org/
- 25. What’s Go good for?
- 26. Go: a general-purpose language Not just a “systems language” Unexpected interest from users of scripting languages Diverse uses across the community ★ Scientific computing ★ Web applications ★ Graphics and sound ★ Network tools ★ … and much more
- 27. Demo: a simple web app
- 28. Recap: Go is Fast compilation time Concurrent Garbage-collected Modern with support for networked and multi-core computing General-purpose Compiled Statically typed like C, Java Feels as easy, lightweight as JS, Python
- 29. What’s next A Tour of Go tour.golang.org The Go Playground play.golang.org Documentation golang.org/doc Go Wiki github.com/golang/go/wiki https://golang.org/
Notas del editor
- Description: Go (又稱 Golang) 是 Google 在 2009 年推出的程式語言。go 以好讀、好寫、執行效率高為主打，也很適合拿來開發 web services。除了 Google 之外，許多公司，包括 Uber、Medium、Docker 等也使用 Go 來開發產品。究竟 Go 有什麼魅力？想知道更多，歡迎來參加這次的讀書會！
- http://stackshare.io/go/in-stacks
- A bit like C
- To run it https://play.golang.org/p/eEZMXonMhA main package: make this program executable (main function is the program entry point) fmt: a package Public vs. private Succinct wording (not as verbose as Java… System.io.println) Dependency made easy https://golang.org/doc/code.html To build & install the program (and its dependencies): $ go install path/to/dir Then run the binary under $GOPATH/bin/<binary-name> To test a program compiles: $ go build path/to/dir To build, install, and run: $ go run path/to/file
- Notice that the type comes after the variable name. Why? https://blog.golang.org/gos-declaration-syntax
- Go is statically typed, but type inference saves repetition.
- A struct is a type which contains named fields Go “objects” are just values. There is no “box”.
- Attracted by an easy, reliable language that performs well. Web app: Concurrency, http package, libraries around it Docker: talking to OS (interface between OS and Go, syscall)
- A simple web app demo