From 3cace734c70c752c57ed9a0057aef4d7ef788528 Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Thu, 6 Sep 2018 21:31:15 +0900
Subject: Add concat function (#2640)

---
 src/prelude/array.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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

diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index aee17640ed..9a3c266d6d 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -6,6 +6,10 @@ export function count<T>(x: T, xs: T[]): number {
 	return countIf(y => x === y, xs);
 }
 
+export function concat<T>(xss: T[][]): T[] {
+	return ([] as T[]).concat(...xss);
+}
+
 export function intersperse<T>(sep: T, xs: T[]): T[] {
-	return [].concat(...xs.map(x => [sep, x])).slice(1);
+	return concat(xs.map(x => [sep, x])).slice(1);
 }
-- 
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