would you believe that I'm adding even more generics

vendor/github.com/jesseduffield/generics/slices/slices.go

@@ -37,6 +37,16 @@ func Map[T any, V any](slice []T, f func(T) V) []V {
 	return result
 }
 
+// Produces a new slice, leaves the input slice untouched.
+func MapWithIndex[T any, V any](slice []T, f func(T, int) V) []V {
+	result := make([]V, 0, len(slice))
+	for i, value := range slice {
+		result = append(result, f(value, i))
+	}
+
+	return result
+}
+
 // Produces a new slice, leaves the input slice untouched.
 func FlatMap[T any, V any](slice []T, f func(T) []V) []V {
 	// impossible to know how long this slice will be in the end but the length
@@ -74,6 +84,18 @@ func Filter[T any](slice []T, test func(T) bool) []T {
 	return result
 }
 
+// Produces a new slice, leaves the input slice untouched.
+func FilterWithIndex[T any](slice []T, f func(T, int) bool) []T {
+	result := make([]T, 0, len(slice))
+	for i, value := range slice {
+		if f(value, i) {
+			result = append(result, value)
+		}
+	}
+
+	return result
+}
+
 // Mutates original slice. Intended usage is to reassign the slice result to the input slice.
 func FilterInPlace[T any](slice []T, test func(T) bool) []T {
 	newLength := 0