Sync

tour_of_go/l6/generics.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+)
+
+type List[T any] struct {
+	next *List[T]
+	val	T
+}
+
+func (l *List[T]) Prepend(v T) *List[T] {
+	return &List[T]{next: l, val: v}
+}
+
+func (l *List[t]) Len() int {
+	count := 0
+	for cur := l; cur != nil; cur = cur.next {
+		count++
+	}
+	return count
+}
+
+func main() {
+	var test_list *List[int]
+	fmt.Println(test_list)
+	test_list = test_list.Prepend(10)
+	fmt.Println(test_list)
+	test_list = test_list.Prepend(20)
+	fmt.Println(test_list)
+	fmt.Printf("The list has %d items\n", test_list.Len())
+	test_list = test_list.Prepend(30)
+	fmt.Println(test_list)
+	
+	fmt.Printf("The list has %d items", test_list.Len())
+}

tour_of_go/l6/index.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func Index[T comparable](s []T, x T) int {
+	for i, v := range s {
+		if v == x {
+			return i
+		}
+	}
+	return -1
+}
+
+func main() {
+	si := []int{10, 20, 15, -10}
+	fmt.Println(Index(si, 15))
+
+	ss := []string{"foo", "bar", "bax"}
+	fmt.Println(Index(ss, "hello"))
+}