From 5735640ab6a67cc72d6671eaeda16fc6397c30c1 Mon Sep 17 00:00:00 2001
From: milarin <milaring@proton.me>
Date: Tue, 20 Feb 2024 16:06:41 +0100
Subject: [PATCH] added FindFirstIndex and FindLastIndex

---
 filter.go | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/filter.go b/filter.go
index ef29dd2..3a816f0 100644
--- a/filter.go
+++ b/filter.go
@@ -19,12 +19,20 @@ func FindFirst[T any](slice []T, f func(T) bool) (T, bool) {
 	return *new(T), false
 }
 
-func FindLast[T any](slice []T, f func(T) bool) (T, bool) {
-	for i := len(slice); i >= 0; i-- {
-		v := slice[i]
+func FindFirstIndex[T any](slice []T, f func(T) bool) (int, bool) {
+	for i, v := range slice {
 		if f(v) {
-			return v, true
+			return i, true
 		}
 	}
-	return *new(T), false
+	return -1, false
+}
+
+func FindLastIndex[T any](slice []T, f func(T) bool) (int, bool) {
+	for i := len(slice); i >= 0; i-- {
+		if f(slice[i]) {
+			return i, true
+		}
+	}
+	return -1, false
 }