What are the key features of Golang that will broaden your horizons and even help you become a better Ruby developer? These are the slides to my presentation I gave at 4developers 2017 conference in Warsaw.

1. WHY SHOULD EVERY RUBY
DEVELOPER LEARN GOLANG?
MICHAŁ KONARSKI
1

2. 2
0,75%
1,5%
2,25%
3%
2012 2013 2014 2015 2016 2017

3. 3
source: http://www.tiobe.com/tiobe-index/go/
POPULARITY OF GO
0,75%
1,5%
2,25%
3%
2012 2013 2014 2015 2016 2017

4. WHO AM I?
4
u2i.com
Ruby developer @

5. 5

6. RESERVED KEYWORDS 6
0
45
90
135
180
JAVASCRIPT C# C++ JAVA RUBY C GO
http://stackoverflow.com/questions/4980766/reserved-keywords-count-by-programming-language

7. 7
dynamic
interpreted (MRI)
static
compiled
object oriented
reflective concurrent
structured
garbage collected garbage collected

8. 8
NoMethodError:
undefined method `retweets' for
#<FacebookPost>

9. STATICALLY TYPED
DUCK TYPING
9

10. 10type Animal interface {
Speak() string
}
type Dog struct {
age int32
}
func (d Dog) Speak() string {
return "Woof!"
}
func SaySomething(a Animal) {
fmt.Println(a.Speak())
}
dog := Dog{}
SaySomething(dog)

11. A STORY OF OO DESIGN
11

12. 12
Vehicle
Car Truck
PetrolCar PetrolTruck
ElectricCar ElectricTruck

13. COMPOSITION OVER
INHERITANCE
13

14. 14
Vehicle
Engine
Body
PetrolEngine
ElectricEngine
CarBody
TruckBody

15. 15
type Engine interface {
start()
}
type Body interface {
weight() int32
}
type Vehicle struct {
Engine
Body
}
vehicle := Vehicle{Engine: PetrolEngine{}, Body: TruckBody{}}
vehicle.start()
vehicle.weight()
type PetrolEngine struct {}
type ElectricEngine struct {}
type CarBody struct {}
type TruckBody struct {}

16. CONCURRENCY
16

17. CONCURRENCY RELATED QUESTIONS ON STACK OVERFLOW 17
0
1750
3500
5250
7000
JAVA C# C++ PYTHON GO SCALA C PHP
http://stackoverflow.com/questions/tagged/concurrency

18. 18
a = Thread.new {
semaphore.synchronize {
# access shared resource
}
}
require 'thread'
semaphore = Mutex.new
b = Thread.new {
semaphore.synchronize {
# access shared resource
}
}

19. DON'T COMMUNICATE BY SHARING MEMORY,
SHARE MEMORY BY COMMUNICATING.
19

20. channel
channel
channel
20
Go process
goroutine goroutine
goroutine goroutine
goroutine goroutine

21. 21
result := <-ch
func HeavyComputations( ) {
...
}
ch <- result
ch chan int32
ch := make(chan int32)
go HeavyComputations(ch)
// do other things

22. 22
THERE IS NOTHING
EXCEPTIONAL IN EXCEPTIONS

23. 23
if err != nil {
fmt.Println(err)
return err
}
f, err := os.Open(“filename.ext")
// do something with the file

24. 24

25. “LEARN AT LEAST ONE NEW
LANGUAGE EVERY YEAR”
25
David Thomas and Andrew Hunt

26. 26
@mjkonarski
michal.konarski@u2i.com
u2i.com
THANKS!