Go 1.21中引入的新包maps和cmp功能作用详解

 m := map[string]int{"one": 1, "two": 2}
 cloned := maps.Clone(m)
 fmt.Println(cloned) // Output: map[one:1 two:2]

 dst := map[string]int{"one": 1}
 src := map[string]int{"two": 2}
 maps.Copy(dst, src)
 // dst is now {"one": 1, "two": 2}
 fmt.Printf("%#v\n", dst)

 m := map[string]int{"one": 1, "two": 2}
 maps.DeleteFunc(m, func(k string, v int) bool { return v == 2 })
 fmt.Println(m) // Output: map[one:1]

 m1 := map[string]int{"one": 1, "two": 2}
 m2 := map[string]int{"one": 1, "two": 2}
 equal := maps.Equal(m1, m2) // true
 fmt.Println(equal)

 result := cmp.Compare(5, 10) // -1
 fmt.Println(result)
 result = cmp.Compare(10, 5) // 1
 fmt.Println(result)
 result = cmp.Compare(5, 5) // 0
 fmt.Println(result)

 isLess := cmp.Less(5, 10) // true
 fmt.Println(isLess)
 isLess = cmp.Less(10, 5) // false
 fmt.Println(isLess)
 isLess = cmp.Less(10, 10) // false
 fmt.Println(isLess)

func Min[T cmp.Ordered](a, b T) T {
 if cmp.Less(a, b) {
  return a
 }
 return b
}
func main() {
 minInt := Min(3, 5)        // minInt is 3
 minString := Min("a", "b") // minString is "a"
 fmt.Println(minInt, minString)
}