diff --git a/_content/doc/play/index-dev.txt b/_content/doc/play/index-dev.txt
new file mode 100644
index 00000000..7fa3a0e1
--- /dev/null
+++ b/_content/doc/play/index-dev.txt
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+)
+
+// The index function returns the index of the first occurrence of v in s,
+// or -1 if not present.
+func index[E comparable](s []E, v E) int {
+	for i, vs := range s {
+		if v == vs {
+			return i
+		}
+	}
+	return -1
+}
+
+func main() {
+	s := []int{1, 3, 5, 2, 4}
+	fmt.Println(index(s, 3))
+	fmt.Println(index(s, 6))
+}
diff --git a/_content/doc/play/min-dev.txt b/_content/doc/play/min-dev.txt
deleted file mode 100644
index 09a4bf3f..00000000
--- a/_content/doc/play/min-dev.txt
+++ /dev/null
@@ -1,18 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"constraints"
-)
-
-func min[P constraints.Ordered](x, y P) P {
-	if x < y {
-		return x
-	} else {
-		return y
-	}
-}
-
-func main() {
-	fmt.Println(min(42, 24))
-}
diff --git a/_content/play.tmpl b/_content/play.tmpl
index f7abe78d..65d63659 100644
--- a/_content/play.tmpl
+++ b/_content/play.tmpl
@@ -36,7 +36,7 @@
     <option value="multi.txt">Multiple Files</option>
     <option value="sleep.go">Sleep</option>
     <option value="test.go">Test Function</option>
-    <option value="min-dev.txt">Generic min</option>
+    <option value="index-dev.txt">Generic index</option>
     </select>
     </div>
   </div>