implemented Greeting (90fb9874) · Commits · ADESTIS Go / greeter

greeter.go

0 → 100644

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		package greeter

		import (
		"fmt"
		"strings"
		)

		const defaultNameText = "World"

		func defaultName(name string) string {
		if name == "" {
		return defaultNameText
		}

		return name
		}

		// Greeting returns a greeting message
		func Greeting(name ...string) string {
		var names strings.Builder

		count := len(name)
		switch count {
		case 0:
		names.WriteString(defaultName(""))
		case 1:
		names.WriteString(defaultName(name[0]))
		default:
		for i, v := range name {
		if i > 0 {
		names.WriteString(", ")
		}

		if i == count-1 {
		names.WriteString("and ")
		}

		names.WriteString(defaultName(v))
		}

		}

		return fmt.Sprintf("Hello, %s!", names.String())
		}

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		package greeter

		import "testing"

		func TestGreeter(t *testing.T) {
		for ti, tc := range []struct {
		name []string
		expected string
		}{
		{name: []string{}, expected: "Hello, World!"},
		{name: []string{""}, expected: "Hello, World!"},
		{name: []string{"Tester"}, expected: "Hello, Tester!"},
		{name: []string{"A", "B"}, expected: "Hello, A, and B!"},
		{name: []string{"A", "B", "C"}, expected: "Hello, A, B, and C!"},
		{name: []string{"A", "", "C"}, expected: "Hello, A, World, and C!"},
		} {
		if tr := Greeting(tc.name...); tr != tc.expected {
		t.Errorf("[% 2d] Greeting(%v) is %q, but got %q", ti, tc.name, tr, tc.expected)
		}
		}
		}