From 534de244065333c97ed11e70e4d8bb49ef0d2566 Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Wed, 19 Dec 2018 09:14:05 +0900
Subject: [PATCH] Use consistent naming convention

---
 src/prelude/array.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index 5a8f36450a..aefc7b3a5b 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -22,8 +22,8 @@ export function erase<T>(x: T, xs: T[]): T[] {
  * Finds the array of all elements in the first array not contained in the second array.
  * The order of result values are determined by the first array.
  */
-export function difference<T>(includes: T[], excludes: T[]): T[] {
-	return includes.filter(x => !excludes.includes(x));
+export function difference<T>(xs: T[], ys: T[]): T[] {
+	return xs.filter(x => !ys.includes(x));
 }
 
 export function unique<T>(xs: T[]): T[] {