From f166829fe46b8a2c98a5fbe1e97ffe4ac7ad9b13 Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Tue, 2 Jan 2024 17:16:56 -0800
Subject: [PATCH] fn: add reduce func

---
 fn/func.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 fn/func.go

diff --git a/fn/func.go b/fn/func.go
new file mode 100644
index 000000000..056f84aef
--- /dev/null
+++ b/fn/func.go
@@ -0,0 +1,17 @@
+package fn
+
+// Reducer represents a function that takes an accumulator and the value, then
+// returns a new accumulator.
+type Reducer[T, V any] func(accum T, value V) T
+
+// Reduce takes a slice of something, and a reducer, and produces a final
+// accumulated value.
+func Reduce[T any, V any, S []V](s S, f Reducer[T, V]) T {
+	var accum T
+
+	for _, x := range s {
+		accum = f(accum, x)
+	}
+
+	return accum
+}