fix(parallel): clamp error with empty array

radashi-org · Jan 7, 2025 · 8d99e9e · 8d99e9e
1 parent 3426478
commit 8d99e9e
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diff --git 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
@@ -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([])
+  })
 })