From 8d99e9e1c44bc2830d27ef8775af02b41dbf4e9d Mon Sep 17 00:00:00 2001
From: Alec Larson <1925840+aleclarson@users.noreply.github.com>
Date: Tue, 7 Jan 2025 12:30:05 -0500
Subject: [PATCH 1/2] fix(parallel): clamp error with empty array

---
 src/async/parallel.ts        | 4 ++++
 tests/async/parallel.test.ts | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/async/parallel.ts b/src/async/parallel.ts
index 42b42e7b..05b0c4dd 100644
--- a/src/async/parallel.ts
+++ b/src/async/parallel.ts
@@ -66,6 +66,10 @@ export async function parallel<T, K>(
   array: readonly T[],
   func: (item: T) => Promise<K>,
 ): Promise<K[]> {
+  if (array.length === 0) {
+    return []
+  }
+
   const work = array.map((item, index) => ({
     index,
     item,
diff --git a/tests/async/parallel.test.ts b/tests/async/parallel.test.ts
index a84ad4bb..df95d2df 100644
--- a/tests/async/parallel.test.ts
+++ b/tests/async/parallel.test.ts
@@ -134,4 +134,11 @@ describe('parallel', () => {
   test('limit defaults to array length if Infinity is passed', async () => {
     await testConcurrency(Number.POSITIVE_INFINITY, _.list(1, 3), [1, 2, 3])
   })
+
+  test('returns empty array for empty input', async () => {
+    const result = await _.parallel(1, [], async () => {
+      throw new Error('Should not be called')
+    })
+    expect(result).toEqual([])
+  })
 })

From 9a18baa2d98d6a92894ec6f469a1eb428db654c1 Mon Sep 17 00:00:00 2001
From: Alec Larson <1925840+aleclarson@users.noreply.github.com>
Date: Tue, 7 Jan 2025 12:46:11 -0500
Subject: [PATCH 2/2] shorten it

---
 src/async/parallel.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/async/parallel.ts b/src/async/parallel.ts
index 05b0c4dd..2587cf11 100644
--- a/src/async/parallel.ts
+++ b/src/async/parallel.ts
@@ -66,7 +66,7 @@ export async function parallel<T, K>(
   array: readonly T[],
   func: (item: T) => Promise<K>,
 ): Promise<K[]> {
-  if (array.length === 0) {
+  if (!array.length) {
     return []
   }