Precalculate index stats

notlinq/notlinq.go

@@ -12,3 +12,13 @@ func UniqueBy[T any, K comparable](items []T, keySelector func(T) K) []T {
 	}
 	return result
 }
+
+func Where[T any](items []T, predicate func(T) bool) []T {
+	result := make([]T, 0)
+	for _, item := range items {
+		if predicate(item) {
+			result = append(result, item)
+		}
+	}
+	return result
+}