My first go program

Toolbox

• Go to

play.golang.org/

• Hack away
• Questions? - Use the Webex Chat

Exercise User

• Create a public struct User with the fields
  • id (uint32)
  • name (string)
  • surname (string)
  • gopher (bool)
• Create your personal user
  • id ← 1
  • name and surname ← add your name
  • gopher ← obviously, true
• Print the result to STDOUT

Solution User

Result User - Solution 1

Result User - Solution 2

Exercise Sort

• Go comes with a sort interface which can be adapted

• Len, Less, and Swap

  type Interface interface {
      // Len is the number of elements in the collection.
      Len() int
  
      // Less reports whether the element with index i
      // must sort before the element with index j.
      Less(i, j int) bool
  
      // Swap swaps the elements with indexes i and j.
      Swap(i, j int)
  }
  

• Create a type which implements the sort.Interface based on a User slice

• Sort the users by ID

Solution Sort

Result Sort

Exercise JSON

• Create a public struct User with the fields (capital letters are important)
  • ID (uint32)
  • Name (string)
  • Surname (string)
  • gopher (bool)
• Create a user and encode the user to a JSON with

  b, err := json.Marshal(m)
  

• Print the JSON (you will only see the fields ID, Name and Surname)
• Decode the JSON with

  var m User
  err := json.Unmarshal(b, &m)
  

  and print the Name

Solution JSON

Result JSON

Thank you