Introduction to Go

A beginner's introduction to go. Presented at DevComo

Transcript

1. An Introduction to Golang James Carr Infrastructure Engineer Lead Zapier
2. Why Go? • Single Binary Deploy • Really Good Standard Library • Concurrency • Tooling • Very clean syntax
3. This Talk • Going to aim at getting started • Walk through basic syntax, idioms and tooling • Accessible for beginners!
4. Go From 10,000 Feet
5. Tooling Built In • `go fmt` - format go code • `go test` - runs unit tests • `go get` - builtin for fetching 3rd party libraries / tools • `go install` - compile and install packages and dependencies
6. Standard Library • Comes with a huge chunk of packages for various common tasks • Io • net/http • encoding/json and encoding/xml • testing • etc.
7. Compiling • Compilation within seconds • No waiting for interpreter or JVM to spin up • Target multiple platforms with cross-compilation • Increased efficiency, very quick feedback loop • Easy deployment - no need for virtualenvs, ensuring correct ruby version, heavy JVM, etc • Just compile and deploy a single binary
8. Concurrency • Goroutines • Very lightweight way to run multiple functions concurrently. Can run hundreds of thousands and implementation varies by OS • Channels • Very elegant way to communicate between goroutines
9. Syntax
10. Typical Hello World
11. Declaring Variables
12. Importing packages
13. Functions
14. Structs Go’s structs are typed collections of fields.
15. Methods
16. Interfaces
17. Note About Interfaces • Very different from most languages, very implicit • Only defines required methods, implementation does not need to reference the interface name • Really good blog post on Go Interfaces: http:// jordanorelli.com/post/32665860244/how-to-use- interfaces-in-go
18. Error Handling Or you could ignore errors altogether…
19. Goroutines
21. Channels
23. Channels Features • Can enforce read-only / write-only usage • Buffer to a specific size • Can iterate over new data as it becomes available • Use switch to handle new messages asynchronously.
25. Some Resources! • Go by example • #go-nuts on free node • Go slack group • Devcomo!