40 lines
925 B
Go
40 lines
925 B
Go
package greetings
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import (
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"errors"
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"fmt"
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"math/rand"
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"time"
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)
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// Hello returns a greeting for the named person.
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func Hello(name string) (string, error) {
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// If no name was given, return an error with a message.
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if name == "" {
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return "", errors.New("empty name")
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}
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// Create a message using a random format.
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message := fmt.Sprintf(randomFormat(), name)
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return message, nil
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}
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// init sets the initial values for variables used in the function.
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// randomFormat returns one of a set of greeting messages. The returned
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// message is selected at random.
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func randomFormat() string {
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// A slide of message formats.
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formats := []string{
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"Hi, %v. Welcome!",
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"Great to see you, %v!",
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"Hail, %v! Well met!",
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}
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// Return a randomly selected message format by specifying
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// a random index fro the slice of formats.
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return formats[rand.Intn(len(formats))]
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}
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