From 4dbdb6a967f056a74ee14d57c1d0bee14af22671 Mon Sep 17 00:00:00 2001
From: Angus MacDonald <amacdonald@google.com>
Date: Fri, 27 Nov 2020 11:21:30 -0600
Subject: [PATCH] Add arrayf.subtract function

---
 src/arrayf/arrayf.ts | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/arrayf/arrayf.ts b/src/arrayf/arrayf.ts
index c53ee4696a..f6518927fd 100644
--- a/src/arrayf/arrayf.ts
+++ b/src/arrayf/arrayf.ts
@@ -28,5 +28,13 @@ export class arrayf {
         return output;
     }
 
-
-}
\ No newline at end of file
+    /**
+     * Remove any elements that exist in the subtrahend from the minuend.
+     * ```
+     * arrayf.subtract([1,2,3], [2,3]); // Returns [1]
+     * ```
+     */
+    static subtract<T>(minuend: T[], subtrahend: T[]): T[] {
+        return minuend.filter((value) => subtrahend.indexOf(value) === -1);
+    }
+}