fix: diff function when root is [] (#111)

* fix: diff function when root is []

fix the behavior of the diff function when the root element is an empty array.
now, if root is an emtpy array [] it will be returned as is, instead if root is null, other will be returned

* chore: bump version to 8.0.1 (patch)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "radash",
-  "version": "8.0.0",
+  "version": "8.0.1",
   "description": "Functional utility library - modern, simple, typed, powerful",
   "main": "dist/cjs/index.cjs",
   "module": "dist/esm/index.mjs",

src/array.ts

@@ -395,7 +395,7 @@ export const diff = <T>(
     t as unknown as string | number | symbol
 ): T[] => {
   if (!root?.length && !other?.length) return []
-  if (!root?.length) return [...other]
+  if (root?.length === undefined) return [...other]
   if (!other?.length) return [...root]
   const bKeys = other.reduce(
     (acc, item) => ({

src/tests/array.test.ts

@@ -518,6 +518,14 @@ describe('array module', () => {
       const result = _.diff(null, null)
       assert.deepEqual(result, [])
     })
+    test('handles empty array root', () => {
+      const result = _.diff([], ['a'])
+      assert.deepEqual(result, [])
+    })
+    test('handles empty array other', () => {
+      const result = _.diff(['a'], [])
+      assert.deepEqual(result, ['a'])
+    })
     test('returns all items from root that dont exist in other', () => {
       const result = _.diff(
         ['a', 'b', 'c'],