From 7959196dc7d8c6f40c16a020492aae11e6136e44 Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Fri, 7 Sep 2018 04:21:04 +0900
Subject: Add sum function (#2653)

---
 src/prelude/array.ts | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/prelude/array.ts')

diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index abef6ca039..54f7081712 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -21,3 +21,7 @@ export function erase<T>(x: T, xs: T[]): T[] {
 export function unique<T>(xs: T[]): T[] {
 	return [...new Set(xs)];
 }
+
+export function sum(xs: number[]): number {
+	return xs.reduce((a, b) => a + b, 0);
+}
-- 
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