generics passing slices and comparing values with comparable

Author: bsnux

Diff for: generics/main.go

@@ -7,6 +7,17 @@ func printThis[T any](value T) {
 	fmt.Println(value)
 }
 
+// index returns the index in the slice for the given item
+// we need to use `comparable` in order to be able to compare values
+func index[T comparable](vs []T, t T) int {
+	for i, v := range vs {
+		if v == t {
+			return i
+		}
+	}
+	return -1
+}
+
 // getKeys returns the keys of the map
 // The value type doesn’t have any restraints but the key type should always
 // satisfy the comparable constraint.
@@ -30,4 +41,12 @@ func main() {
 
 	keysInt := getKeys(map[int]int{1: 1, 2: 2})
 	fmt.Println(keysInt)
+
+
+  arrStr := []string{"one", "two", "three"}
+	arrInt := []int{1, 3, 2}
+  idxStr := index(arrStr, "three")
+  idxInt := index(arrInt, 3)
+  fmt.Println(idxStr)
+  fmt.Println(idxInt)
 }