Learning GO

types/cmd/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"fmt"
+	"hello"
+	"os"
+)
+
+func main() {
+	fmt.Println(hello.Say(os.Args[1:]))
+}

types/go.mod

@@ -0,0 +1,3 @@
+module hello
+
+go 1.26.5

types/hello.go

@@ -0,0 +1,13 @@
+package hello
+
+import (
+	"strings"
+)
+
+func Say(names []string) string {
+
+	if len(names) == 0 {
+		names = []string{"world"}
+	}
+	return "Hello, " + strings.Join(names, ", ") + "!"
+}

types/hello_test.go

@@ -0,0 +1,30 @@
+package hello
+
+import (
+	"testing"
+)
+
+func TestSayHello(t *testing.T) {
+
+	subtests := []struct {
+		items  []string
+		result string
+	}{
+		{
+			result: "Hello, world!",
+		},
+		{
+			items:  []string{"Leena"},
+			result: "Hello, Leena!",
+		},
+		{
+			items:  []string{"Zack", "Sami", "Sara"},
+			result: "Hello, Zack, Sami, Sara!",
+		},
+	}
+	for _, st := range subtests {
+		if s := Say(st.items); s != st.result {
+			t.Errorf("wanted %s (%v), got %s", st.result, st.items, s)
+		}
+	}
+}