From e8948452fdc18f8a85af34bc4687e304cd39c987 Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Thu, 6 Sep 2018 02:28:04 +0900
Subject: Resolve #2629 (#2630)

---
 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 e944030a7f..aee17640ed 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -5,3 +5,7 @@ export function countIf<T>(f: (x: T) => boolean, xs: T[]): number {
 export function count<T>(x: T, xs: T[]): number {
 	return countIf(y => x === y, xs);
 }
+
+export function intersperse<T>(sep: T, xs: T[]): T[] {
+	return [].concat(...xs.map(x => [sep, x])).slice(1);
+}
-- 
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