Introduce go-mnd

Transcript

1. Tommy Mühle | tommy-muehle.io Tommy Mühle Software Engineer and Author

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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