Introduce go-mnd

Short introduction of go-mnd, the magic number detector for Go.

Transcript

1. Tommy Mühle | tommy-muehle.io Tommy Mühle Software Engineer and Author 1
2. Tommy Mühle | tommy-muehle.io Introduce go-mnd 2
3. Tommy Mühle | tommy-muehle.io A vet analyzer to detect magic numbers 3
4. Tommy Mühle | tommy-muehle.io Magic number? 4
5. Tommy Mühle | tommy-muehle.io Tommy Mühle | tommy-muehle.io A magic number is a numeric literal that is not defined as a constant, but which may change, and therefore can be hard to update. 5
6. Tommy Mühle | tommy-muehle.io Hide intention 6
7. Tommy Mühle | tommy-muehle.io Hard to change 7
8. package main import `github.com/google/go-github/github` func main() { var repo github.Repository // ... if repo.GetTeamID() == 12 { // ... } } Tommy Mühle | tommy-muehle.io 8
9. package main import `github.com/google/go-github/github` const TeamEngineering = 12 func main() { var repo github.Repository // ... if repo.GetTeamID() == TeamEngineering { // ... } } Tommy Mühle | tommy-muehle.io 9
10. Tommy Mühle | tommy-muehle.io How it works 10
11. Tommy Mühle | tommy-muehle.io 11 >= 1.12
12. Tommy Mühle | tommy-muehle.io Supported checks 12
13. package main import ( "net/http" "time" ) func main() { client := &http.Client{ Timeout: 5 * time.Second, } // ... } Tommy Mühle | tommy-muehle.io 13 Assignment
14. Tommy Mühle | tommy-muehle.io 14 package main import ( "fmt" "time" ) func main() { t := time.Now() switch { case t.Hour() < 12: fmt.Println("Good morning!") default: fmt.Println("Good evening.") } } Case
15. package main import "net/http" func handler(w http.ResponseWriter, r *http.Request) { // ... http.Error(w, http.StatusText(404), 404) } Tommy Mühle | tommy-muehle.io 15 Argument
16. package main type queue struct { // ... } // ... func (q *queue) MaxLength() int { return 500 } Tommy Mühle | tommy-muehle.io 16 Return
17. package main func main() { var y int // ... x := y * 100 // ... } Tommy Mühle | tommy-muehle.io 17 Operator
18. Tommy Mühle | tommy-muehle.io 18 package main func main() { var x int // ... if x > 100 { // ... } } Condition
19. Tommy Mühle | tommy-muehle.io Demo 19
20. Tommy Mühle | tommy-muehle.io 20
21. Tommy Mühle | tommy-muehle.io 21
22. Tommy Mühle | tommy-muehle.io 22
23. Tommy Mühle | tommy-muehle.io 22
24. Questions?
25. Thank you! Slides http:/ /bit.ly/2pTywBB @tommy_muehle