Why every Ruby programmer should learn Golang?

1. GOLANG VS RUBY
MICHAŁ KONARSKI
1

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

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

4. WHO AM I?
4
u2i
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. STATICALLY TYPED
DUCK TYPING
8

9. 9type 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)

10. 000 DESIGN
10

11. 11
Vehicle
Car Truck
PetrolCar PetrolTruck
ElectricCar ElectricTruck

12. COMPOSITION OVER
INHERITANCE
12

13. 13
Vehicle
Engine
Body
PetrolEngine
ElectricEngine
Car
Truck

14. 14
type Engine interface {
start()
}
type PetrolEngine struct {}
type ElectricEngine struct {}
type Body interface {
weight() int32
}
type Car struct {}
type Truck struct {}
type Vehicle struct {
Engine
Body
}
vehicle := Vehicle{Engine: PetrolEngine{}, Body: Truck{}}
vehicle.start()
vehicle.weight()

15. CONCURRENCY
15

16. DON'T COMMUNICATE BY SHARING MEMORY,
SHARE MEMORY BY COMMUNICATING.
16

17. channel
channel
channel
17
Go process
goroutine goroutine
goroutine goroutine
goroutine goroutine

18. 18
result := <-ch
func HeavyComputations( ) {
...
}
ch <- result
ch chan int32
ch := make(chan int32)
go HeavyComputations(ch)
// do other things

19. 19
THERE IS NOTHING
EXCEPTIONAL IN EXCEPTIONS

20. 20
if err != nil {
log.Fatal(err)
return err
}
f, err := os.Open(“filename.ext")
// do something with the file

21. 21
GO FMT
NO MORE CODE STYLE WARS

22. 22

23. “LEARN AT LEAST ONE NEW
LANGUAGE EVERY YEAR”
23
David Thomas and Andrew Hunt

24. 24
@mjkonarski
michal.konarski@u2i.com
blog.u2i.com
THANKS!