wip: 保存 Go 练习和技术笔记

go/testing/normal_test.go

@@ -1,6 +1,7 @@
 package testing
 
 import (
+	"fmt"
 	"sort"
 	"testing"
 	"time"
@@ -46,3 +47,63 @@ func TestChannel(t *testing.T) {
 	var c chan bool // 一个零值nil通道
 	<-c             // 永久阻塞在此
 }
+
+func TestFeature1(t *testing.T) {
+	type Person struct {
+		Sex  string
+		Name string
+	}
+	type Student struct {
+		StudentID int
+		Person
+	}
+
+	s1 := Student{
+		StudentID: 1,
+		Sex:       "male",
+		Name:      "张三",
+	}
+	t.Log(s1)
+}
+
+func TestFeature2(t *testing.T) {
+	// Go 1.27 之前：必须手动写出类型实参 [int]，否则编译报错
+	fn1 := IntToString(FormatToString[int])
+	fn2 := IntToString(FormatToString)
+
+	oldFormat := []IntToString{FormatToString[int]}
+	newFormat := []IntToString{FormatToString}
+
+	t.Log(fn1(1))
+	t.Log(fn2(2))
+	for i, fn := range oldFormat {
+		t.Log(fn(i))
+	}
+	for i, fn := range newFormat {
+		t.Log(fn(i))
+	}
+
+}
+
+// 一个泛型格式化函数
+func FormatToString[T any](v T) string {
+	return fmt.Sprintf("value: %v", v)
+}
+
+// 具名函数类型：接收一个 int，返回 string
+type IntToString func(int) string
+
+func TestSort(t *testing.T) {
+	slice := []int{8, 2, 4, 4}
+	Sort1(slice)
+	t.Log(slice)
+}
+func Sort1(slice []int) {
+	for i := 0; i < len(slice)-1; i++ {
+		for j := 0; j < len(slice)-1-i; j++ {
+			if slice[j] > slice[j+1] {
+				slice[j], slice[j+1] = slice[j+1], slice[j]
+			}
+		}
+	}
+}