From 3c61cd9e8217ce5648084aabac84a187accfdf26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E6=B6=9B?= <midnite@outlook.com>
Date: Mon, 15 Aug 2022 09:23:19 +0800
Subject: [PATCH] =?UTF-8?q?feat(utils):=E5=A2=9E=E5=8A=A0=E4=B8=80?=
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---
 utils/functional.go | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 utils/functional.go

diff --git a/utils/functional.go b/utils/functional.go
new file mode 100644
index 0000000..c8f69fd
--- /dev/null
+++ b/utils/functional.go
@@ -0,0 +1,27 @@
+package utils
+
+func Map[S, T any](source []S, f func(S) T) []T {
+	dest := make([]T, len(source))
+	for i, elem := range source {
+		dest[i] = f(elem)
+	}
+	return dest
+}
+
+func Reduce[S, T any](source []S, initialValue T, f func(T, S) T) T {
+	acc := initialValue
+	for _, elem := range source {
+		acc = f(acc, elem)
+	}
+	return acc
+}
+
+func Filter[T any](source []T, f func(T) bool) []T {
+	var dest []T
+	for _, elem := range source {
+		if f(elem) {
+			dest = append(dest, elem)
+		}
+	}
+	return dest
+}