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

9.
Companies Using Go
http://stackshare.io/go/in-stacks

10.
Some basic syntax

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

20.
Concurrency: goroutines
Lightweight threads

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/