This document provides an introduction to the Go programming language by SeongJae Park. It discusses why Go was developed, including to address pains with dependency management, build speeds, type safety, garbage collection and multi-core support in other languages. It then demonstrates Go concepts like packages, functions, variables, structs and interfaces through a live coding example of a web server. Finally, it references a presentation that further explains Go's advantages for multicore programming.

1. An Introduction to Golang
SeongJae Park <sj38.park@gmail.com>

2. This work by SeongJae Park is licensed under the Creative
Commons Attribution-ShareAlike 3.0 Unported License. To
view a copy of this license, visit http://creativecommons.
org/licenses/by-sa/3.0/.

3. These slides were presented during
16th TechTalk@Pangyo
(https://www.facebook.com/events/1674282256125660/1674377356116150/)

4. Nice To Meet You
SeongJae Park
sj38.park@gmail.com
golang newbie programmer

5. Disclaimer
I am not professional Gopher
I respect other languages

6. Golang: Programming Language
● “Go is an open source programming language that makes it easy to build
simple, reliable, and efficient software.”, http://golang.org
http://blog.golang.org/5years/gophers5th.jpg

7. Why They Are Developing Golang?
● So many pains without perfect solution in currently available system
languages
○ Computers are being faster, but development speed is not
○ Dependency management is hard; It makes build task slower
○ Dynamically typed languages are dangerous and slow
○ Garbage collection is not supported well
○ Number of cores per computer is growing

8. Why They Are Developing Golang?
● So many pains without perfect solution in currently available system
languages
○ Computers are being faster, but development speed is not
○ Dependency management is hard; It makes build task slower
○ Dynamically typed languages are dangerous and slow
○ Garbage collection is not supported well
○ Number of cores per computer is growing
● Sometimes, restarting is the solution
○ Use package concept for simpler dependency management
○ Typed language with syntax that is easy to type like dynamically typed languages
○ Garbage collection based (garbage collection optimization is going on)
○ CSP based concurrency support

9. Live Coding Now...
I will program a web server now, at here
The program is inspired from the outyet(https://github.com/golang/example/tree/master/outyet)

10. Live Coding Now...
● Now, you understand…
○ Package system (helps dependency management)
○ Function (Consistent syntax)
○ Variable declaration with explicit / implicit type declaration
https://github.com/sjp38/techtalk_outyet/blob/ebd4f1f70a47aacb18d92fe1db4f407eac7980d5/main.go

11. Live Coding Now...
● Now, you understand…
○ Package system (helps dependency management)
○ Function (Consistent syntax)
○ Variable declaration with explicit / implicit type declaration
○ Struct, type, method, and interface (Composition, not inheritance)
https://github.com/sjp38/techtalk_outyet/blob/e03ce235be9ef99e46297f53139189a9b76e391b/main.go

12. Live Coding Now...
● Now, you understand…
○ Package system (helps dependency management)
○ Function (Consistent syntax)
○ Variable declaration with explicit / implicit type declaration
○ Struct, type, method, and interface (Composition, not inheritance)
○ Concurrency using goroutine (Not thread, not co-routine)
https://github.com/sjp38/techtalk_outyet/blob/d6d0d7ed1503a1697356cee54b503b47462c9398/main.go

13. Live Coding Now...
● Now, you understand…
○ Package system (helps dependency management)
○ Function (Consistent syntax)
○ Variable declaration with explicit / implicit type declaration
○ Struct, type, method, and interface (Composition, not inheritance)
○ Concurrency using goroutine (Not thread, not co-routine)
○ Communication between goroutine using channel
https://github.com/sjp38/techtalk_outyet/blob/8248c6fd2bc524e991fa18448ca99bb30d288b18/main.go

14. What Makes Golang So Special on Multicore?
I will explain about that with Dave Chenny’s OSCON’15 presentation (not mine)
http://cdn.oreillystatic.com/en/assets/1/event/129/High%20performance%20servers%20without%20the%
20event%20loop%20Presentation.pdf

15. Thank You
http://jeancharpentier.files.wordpress.com/2012/02/capture-plein-c3a9cran-01022012-230955.jpg