2021-09-02 19:08:57 +00:00

59 lines
1.7 KiB
Go

package greetings
import (
"errors"
"fmt"
"math/rand"
"time"
)
// Hello returns a greeting for the named person.
func Hello(name string) (string, error) {
// If no name was given, return an error with a message.
if name == "" {
return name, errors.New("empty name")
}
// Create a message using a random format.
message := fmt.Sprintf(randomFormat(), name)
// message := fmt.Sprintf(randomFormat())
return message, nil
}
// Hellos returns a map that associates each of the named people
// with a greeting message.
func Hellos(names []string) (map[string]string, error) {
// A map to associate names with messages.
messages := make(map[string]string)
// Loop through the received slice of names, calling
// the Hello function to get a message for each name.
for _, name := range names {
message, err := Hello(name)
if err != nil {
return nil, err
}
// In the map, associate the retrieved message with
// the name.
messages[name] = message
}
return messages, nil
}
// init sets initial values for variables used in the function.
func init() {
rand.Seed(time.Now().UnixNano())
}
// randomFormat returns one of a set of greeting messages. The returned
// message is selected at random.
func randomFormat() string {
// A slice of message formats.
formats := []string{
"Hi, %v. Welcome!",
"Great to see you, %v!",
"Hail, %v! Well met!",
}
// Return a randomly selected message format by specifying
// a random index for the slice of formats.
return formats[rand.Intn(len(formats))]
}