19. Special Features

Activity 19.01: Defining Build Constraints Using Filenames

Solution:

1. Create a directory called custom.
2. Inside this directory, create a file called print_darwin.go.
3. Define a function called Print():

   package custom
   import "fmt"
   func Print() {
     fmt.Println("Hello I am running on a darwin machine.")
   }

4. Create another file inside the custom directory called print_386.go.
5. Define a function inside this package called Print():

   import "fmt"
   func Print() {
     fmt.Println("Hello I am running on 386 machine.")
   }

6. Run the program using the following command:

   go run main.go

   You should see the following output:

   $ go run main.go
   Hello I am running on a darwin machine.

Activity 19.02: Using Wildcard with Go Test

Solution:

1. Create a directory called package1:

   Figure 19.5: Directory structure

2. Create run_test.go in this directory with the following test cases defined:

   package package1...