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Introduce go-mnd
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Tommy Mühle
February 06, 2020
Programming
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140
Introduce go-mnd
Short introduction of go-mnd, the magic number detector for Go.
Tommy Mühle
February 06, 2020
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Transcript
Tommy Mühle | tommy-muehle.io Tommy Mühle Software Engineer and Author
1
Tommy Mühle | tommy-muehle.io Introduce go-mnd 2
Tommy Mühle | tommy-muehle.io A vet analyzer to detect magic
numbers 3
Tommy Mühle | tommy-muehle.io Magic number? 4
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
Tommy Mühle | tommy-muehle.io Hide intention 6
Tommy Mühle | tommy-muehle.io Hard to change 7
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
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
Tommy Mühle | tommy-muehle.io How it works 10
Tommy Mühle | tommy-muehle.io 11 >= 1.12
Tommy Mühle | tommy-muehle.io Supported checks 12
package main import ( "net/http" "time" ) func main() {
client := &http.Client{ Timeout: 5 * time.Second, } // ... } Tommy Mühle | tommy-muehle.io 13 Assignment
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
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
package main type queue struct { // ... } //
... func (q *queue) MaxLength() int { return 500 } Tommy Mühle | tommy-muehle.io 16 Return
package main func main() { var y int // ...
x := y * 100 // ... } Tommy Mühle | tommy-muehle.io 17 Operator
Tommy Mühle | tommy-muehle.io 18 package main func main() {
var x int // ... if x > 100 { // ... } } Condition
Tommy Mühle | tommy-muehle.io Demo 19
Tommy Mühle | tommy-muehle.io 20
Tommy Mühle | tommy-muehle.io 21
Tommy Mühle | tommy-muehle.io 22
Tommy Mühle | tommy-muehle.io 22
Questions?
Thank you! Slides http:/ /bit.ly/2pTywBB @tommy_muehle