From 08da4520740f6a0d3b82345d379bb8497f2f74d7 Mon Sep 17 00:00:00 2001
From: Shashi Ranjan <shashi@stackbox.xyz>
Date: Wed, 21 May 2025 16:21:56 +0530
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20default=20to=20empty=20array=20i?=
 =?UTF-8?q?n=20sumBy=20&=20countBy?=
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---
 src/lang.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/lang.ts b/src/lang.ts
index 326a281..ef5eb7b 100644
--- a/src/lang.ts
+++ b/src/lang.ts
@@ -232,22 +232,22 @@ export const maxBy = <T>(
 };
 
 export const sumBy = <T>(
-  items: ReadonlyArray<T>,
+  items: ReadonlyArray<T> | undefined,
   fn: (x: T) => number,
 ): number => {
   let s = 0;
-  for (const item of items) {
+  for (const item of items ?? []) {
     s += fn(item);
   }
   return s;
 };
 
 export const countBy = <T>(
-  items: ReadonlyArray<T>,
+  items: ReadonlyArray<T> | undefined,
   fn: (x: T) => boolean,
 ): number => {
   let s = 0;
-  for (const item of items) {
+  for (const item of items ?? []) {
     if (fn(item)) {
       s++;
     }