docs: Add example showing how to use uniqBy with object arrays (#410)

* Add example showing how to use uniqBy with object arrays

* Add uniqBy example with objects to other docs

* Apply suggestions from code review

* Update src/array/uniqBy.ts

---------

Co-authored-by: Sojin Park <raon0211@gmail.com>

docs/ko/reference/array/uniqBy.md

@@ -23,3 +23,13 @@ function uniqBy<T, U>(arr: T[], mapper: (item: T) => U): T[];
 uniqBy([1.2, 1.5, 2.1, 3.2, 5.7, 5.3, 7.19], Math.floor);
 // [1.2, 2.1, 3.2, 5.7, 7.19]
 ```
+
+```typescript
+const array = [
+  { category: 'fruit', name: 'apple' },
+  { category: 'fruit', name: 'banana' },
+  { category: 'vegetable', name: 'carrot' },
+];
+uniqBy(array, item => item.category).length
+// 2
+```

docs/reference/array/uniqBy.md

@@ -23,3 +23,14 @@ function uniqBy<T, U>(arr: T[], mapper: (item: T) => U): T[];
 uniqBy([1.2, 1.5, 2.1, 3.2, 5.7, 5.3, 7.19], Math.floor);
 // [1.2, 2.1, 3.2, 5.7, 7.19]
 ```
+
+```typescript
+const array = [
+  { category: 'fruit', name: 'apple' },
+  { category: 'fruit', name: 'banana' },
+  { category: 'vegetable', name: 'carrot' },
+];
+uniqBy(array, item => item.category).length
+// 2
+```
+

docs/zh_hans/reference/array/uniqBy.md

@@ -23,3 +23,13 @@ function uniqBy<T, U>(arr: T[], mapper: (item: T) => U): T[];
 uniqBy([1.2, 1.5, 2.1, 3.2, 5.7, 5.3, 7.19], Math.floor);
 // [1.2, 2.1, 3.3, 5.7, 7.19]
 ```
+
+```typescript
+const array = [
+  { category: 'fruit', name: 'apple' },
+  { category: 'fruit', name: 'banana' },
+  { category: 'vegetable', name: 'carrot' },
+];
+uniqBy(array, item => item.category).length
+// 2
+```

src/array/uniqBy.ts

@@ -13,6 +13,16 @@
  * uniqBy([1.2, 1.5, 2.1, 3.2, 5.7, 5.3, 7.19], Math.floor);
  * // [1.2, 2.1, 3.2, 5.7, 7.19]
  * ```
+ * 
+ * @example
+ * const array = [
+ *   { category: 'fruit', name: 'apple' },
+ *   { category: 'fruit', name: 'banana' },
+ *   { category: 'vegetable', name: 'carrot' },
+ * ];
+ * uniqBy(array, item => item.category).length
+ * // 2
+ * ```
  */
 export function uniqBy<T, U>(arr: readonly T[], mapper: (item: T) => U): T[] {
   const map = new Map<U, T>();