filter.go

@@ -19,20 +19,12 @@ func FindFirst[T any](slice []T, f func(T) bool) (T, bool) {
 	return *new(T), false
 }
 
-func FindFirstIndex[T any](slice []T, f func(T) bool) (int, bool) {
-	for i, v := range slice {
-		if f(v) {
-			return i, true
-		}
-	}
-	return -1, false
-}
-
-func FindLastIndex[T any](slice []T, f func(T) bool) (int, bool) {
+func FindLast[T any](slice []T, f func(T) bool) (T, bool) {
 	for i := len(slice); i >= 0; i-- {
-		if f(slice[i]) {
-			return i, true
+		v := slice[i]
+		if f(v) {
+			return v, true
 		}
 	}
-	return -1, false
+	return *new(T), false
 }

of.go

@@ -14,15 +14,3 @@ func OfMap[K comparable, V, T any](m map[K]V, unmapper func(K, V) T) []T {
 	}
 	return out
 }
-
-// UnmapKey is an unmapper function which returns the map key only
-// and discards its value. It is supposed to be used with OfMap
-func UnmapKey[K comparable, V any](key K, _ V) K {
-	return key
-}
-
-// UnmapValue is an unmapper function which returns the map value only
-// and discards its key. It is supposed to be used with OfMap
-func UnmapValue[K comparable, V any](_ K, value V) V {
-	return value
-}