From ab6e6684f81776f199f3f9706864a6e7a925e661 Mon Sep 17 00:00:00 2001
From: milarin <milaring@proton.me>
Date: Thu, 9 Mar 2023 14:34:44 +0100
Subject: [PATCH] added Reduce method

---
 go.mod         |  4 +++-
 go.sum         |  4 ++--
 reduce.go      | 15 +++++++++++++++
 reduce_test.go | 11 +++++++++++
 4 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 reduce.go
 create mode 100644 reduce_test.go

diff --git a/go.mod b/go.mod
index 53fb616..f1fa267 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module git.milar.in/milarin/slices
 
-go 1.19
\ No newline at end of file
+go 1.19
+
+require git.milar.in/milarin/gmath v0.0.3
diff --git a/go.sum b/go.sum
index e592c3c..4e47344 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-git.milar.in/milarin/channel v0.0.7 h1:cVKtwgH/EE7U+XTHcoFCClJ4LR349KanzjX9xKwRcNg=
-git.milar.in/milarin/channel v0.0.7/go.mod h1:We83LTI8S7u7II3pD+A2ChCDWJfCkcBUCUqii9HjTtM=
+git.milar.in/milarin/gmath v0.0.3 h1:ii6rKNItS55O/wtIFhD1cTN2BMwDZjTBmiOocKURvxM=
+git.milar.in/milarin/gmath v0.0.3/go.mod h1:HDLftG5RLpiNGKiIWh+O2G1PYkNzyLDADO8Cd/1abiE=
diff --git a/reduce.go b/reduce.go
new file mode 100644
index 0000000..cd56b32
--- /dev/null
+++ b/reduce.go
@@ -0,0 +1,15 @@
+package slices
+
+import "git.milar.in/milarin/gmath"
+
+func Reduce[T, R any](slice []T, reducer func(current R, v T) R) R {
+	res := new(R)
+	Each(slice, func(v T) {
+		*res = reducer(*res, v)
+	})
+	return *res
+}
+
+func SumReducer[N gmath.Number](a, b N) N {
+	return a + b
+}
diff --git a/reduce_test.go b/reduce_test.go
new file mode 100644
index 0000000..14df6d4
--- /dev/null
+++ b/reduce_test.go
@@ -0,0 +1,11 @@
+package slices
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestReduce(t *testing.T) {
+	s := Of(1, 2, 3)
+	fmt.Println(Reduce(s, SumReducer[int]))
+}