17. Using Go Tools

Activity 17.01: Using gofmt, goimport, go vet, and go get to Correct a File

Solution:

1. Run gofmt against the file to check for any formatting issues and see that they make sense:

   gofmt main.go

   This should output a much neater-looking file, as follows:

   Figure 17.11: Expected output from gofmt

2. Use the -w option on gofmt to make the changes to the file and save them:

   gofmt -w main.go

3. Check the imports are correct using goimports:

   goimport main.go

4. Use goimports to fix the import statements in the file:

   goimports -w main.go

5. The final stage is to use go vet to check for any issues the compiler might miss. Run it against main.go to check for any issues:

   go vet main.go

6. It will find an issue with unreachable code, as shown in the following output:

   Figure 17.12: Expected output from go vet

7. Correct the issue by moving the log.Println("completed") line so that it runs before the return statement:

   func ExampleHandler(w http.ResponseWriter, r...