From d54e91c6582ed160cf2f2fcf977e48b4439d133b Mon Sep 17 00:00:00 2001
From: Elizabeth Alexander Hunt <me@liz.coffee>
Date: Sun, 18 May 2025 22:54:15 -0700
Subject: snapshot

---
 u/fn/either.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'u/fn/either.ts')

diff --git a/u/fn/either.ts b/u/fn/either.ts
index 9dc1027..8b233bf 100644
--- a/u/fn/either.ts
+++ b/u/fn/either.ts
@@ -10,7 +10,7 @@ export interface IEither<E, T> {
     errBranch: Mapper<E, Ee>,
     okBranch: Mapper<T, Tt>,
   ) => IEither<Ee, Tt>;
-  fold: <Tt>(folder: BiMapper<E | null, T | null, Tt>) => Tt;
+  fold: <Tt>(folder: BiMapper<E | undefined, T | undefined, Tt>) => Tt;
   moveRight: <Tt>(t: Tt) => IEither<E, Tt>;
   mapRight: <Tt>(mapper: Mapper<T, Tt>) => IEither<E, Tt>;
   mapLeft: <Ee>(mapper: Mapper<E, Ee>) => IEither<Ee, T>;
@@ -31,8 +31,8 @@ export class Either<E, T> implements IEither<E, T> {
     return this.mapRight(() => t);
   }
 
-  public fold<R>(folder: BiMapper<E | null, T | null, R>): R {
-    return folder(this.err ?? null, this.ok ?? null);
+  public fold<R>(folder: BiMapper<E | undefined, T | undefined, R>): R {
+    return folder(this.err ?? undefined, this.ok ?? undefined);
   }
 
   public mapBoth<Ee, Tt>(
-- 
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