From 580191fb172eccbbd12c2dfbccbd8346f38de91e Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Sat, 22 Dec 2018 00:41:54 +0900
Subject: Improve MFM bracket matching

Co-authored-by: syuilo <syuilotan@yahoo.co.jp>
---
 src/prelude/array.ts | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/prelude')

diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index d02de9b2e5..560dfa080d 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -109,3 +109,9 @@ export function takeWhile<T>(f: Predicate<T>, xs: T[]): T[] {
 	}
 	return ys;
 }
+
+export function cumulativeSum(xs: number[]): number[] {
+	const ys = Array.from(xs); // deep copy
+	for (let i = 1; i < ys.length; i++) ys[i] += ys[i - 1];
+	return ys;
+}
-- 
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