feat(uniqueId): Add uniqueId to compat layer

benchmarks/performance/uniqueId.bench.ts

@@ -0,0 +1,31 @@
+import { bench, describe } from 'vitest';
+import { uniqueId as uniqueIdToolkitCompat } from 'es-toolkit/compat';
+import { uniqueId as uniqueIdLodash } from 'lodash';
+
+describe('uniqueId', () => {
+  bench('es-toolkit/compat/uniqueId', () => {
+    uniqueIdToolkitCompat();
+    uniqueIdToolkitCompat();
+    uniqueIdToolkitCompat();
+    uniqueIdToolkitCompat();
+    uniqueIdToolkitCompat();
+    uniqueIdToolkitCompat('prefix_');
+    uniqueIdToolkitCompat('prefix_');
+    uniqueIdToolkitCompat('prefix_');
+    uniqueIdToolkitCompat('prefix_');
+    uniqueIdToolkitCompat('prefix_');
+  });
+
+  bench('lodash/uniqueId', () => {
+    uniqueIdLodash();
+    uniqueIdLodash();
+    uniqueIdLodash();
+    uniqueIdLodash();
+    uniqueIdLodash();
+    uniqueIdLodash('prefix_');
+    uniqueIdLodash('prefix_');
+    uniqueIdLodash('prefix_');
+    uniqueIdLodash('prefix_');
+    uniqueIdLodash('prefix_');
+  });
+});

docs/ja/reference/compat/util/uniqueId.md

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+# toString
+
+::: info
+この関数は互換性のために `es-toolkit/compat` からのみインポートできます。代替可能なネイティブ JavaScript API があるか、まだ十分に最適化されていないためです。
+
+`es-toolkit/compat` からこの関数をインポートすると、[lodash と完全に同じように動作](../../../compatibility.md)します。
+:::
+
+Generates a unique ID. If prefix is given, the ID is appended to it.
+
+## インターフェース
+
+```typescript
+function uniqueId(value?: string): string;
+```
+
+### パラメータ
+
+- `value` (`string`, optional): ID の先頭に付ける値。
+
+### 戻り値
+
+(`string`): 一意の ID を返します。
+
+## 例
+
+```typescript
+uniqueId('contact_'); // => 'contact_104'
+uniqueId(); // => '105'
+```

docs/ko/reference/compat/util/uniqueId.md

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+# uniqueId
+
+::: info
+이 함수는 호환성을 위한 `es-toolkit/compat` 에서만 가져올 수 있어요. 대체할 수 있는 네이티브 JavaScript API가 있거나, 아직 충분히 최적화되지 않았기 때문이에요.
+
+`es-toolkit/compat`에서 이 함수를 가져오면, [lodash와 완전히 똑같이 동작](../../../compatibility.md)해요.
+:::
+
+고유 ID를 생성해요. 접두사가 주어지면 ID가 추가돼요.
+
+## 인터페이스
+
+```typescript
+function uniqueId(value?: string): string;
+```
+
+### 파라미터
+
+- `value` (`string`, optional): ID 앞에 붙는 값.
+
+### 반환 값
+
+(`string`): 고유 ID 값.
+
+## 예시
+
+```typescript
+uniqueId('contact_'); // => 'contact_104'
+uniqueId(); // => '105'
+```

docs/reference/compat/util/uniqueId.md

@@ -0,0 +1,30 @@
+# constant
+
+::: info
+This function is only available in `es-toolkit/compat` for compatibility reasons. It either has alternative native JavaScript APIs or isn’t fully optimized yet.
+
+When imported from `es-toolkit/compat`, it behaves exactly like lodash and provides the same functionalities, as detailed [here](../../../compatibility.md).
+:::
+
+Generates a unique ID. If prefix is given, the ID is appended to it.
+
+## Signature
+
+```typescript
+function uniqueId(value?: string): string;
+```
+
+### Parameters
+
+- `value` (`string`, optional): The value to prefix the ID with.
+
+### Returns
+
+(`string`): Returns the unique ID.
+
+## Examples
+
+```typescript
+uniqueId('contact_'); // => 'contact_104'
+uniqueId(); // => '105'
+```

docs/zh_hans/reference/compat/util/uniqueId.md

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+# toString
+
+::: info
+出于兼容性原因，此函数仅在 `es-toolkit/compat` 中提供。它可能具有替代的原生 JavaScript API，或者尚未完全优化。
+
+从 `es-toolkit/compat` 导入时，它的行为与 lodash 完全一致，并提供相同的功能，详情请见 [这里](../../../compatibility.md)。
+:::
+
+生成唯一的 ID。如果给出了前缀，则将 ID 附加到其上。
+
+## 签名
+
+```typescript
+function uniqueId(value?: string): string;
+```
+
+### 参数
+
+- `value` (`string`, optional): ID 的前缀值。
+
+### 返回值
+
+(`string`): 返回唯一 ID。
+
+## 示例
+
+```typescript
+uniqueId('contact_'); // => 'contact_104'
+uniqueId(); // => '105'
+```

src/compat/index.ts

@@ -157,3 +157,4 @@ export { toNumber } from './util/toNumber.ts';
 export { toPath } from './util/toPath.ts';
 export { toSafeInteger } from './util/toSafeInteger.ts';
 export { toString } from './util/toString.ts';
+export { uniqueId } from './util/uniqueId.ts';

src/compat/util/uniqueId.spec.ts

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+import { describe, expect, it } from 'vitest';
+import { uniqueId } from './uniqueId';
+
+describe('uniqueId', () => {
+  it('should generate unique numeric IDs when called without a prefix', () => {
+    const id1 = uniqueId();
+    const id2 = uniqueId();
+
+    expect(id1).toBe('1');
+    expect(id2).toBe('2');
+  });
+
+  it('should append increasing numeric IDs to the given prefix', () => {
+    const prefixedId1 = uniqueId('test_');
+    const prefixedId2 = uniqueId('test_');
+
+    expect(prefixedId1).toBe('test_3');
+    expect(prefixedId2).toBe('test_4');
+  });
+
+  it('should handle empty string prefix', () => {
+    const id = uniqueId('');
+    expect(id).toBe('5');
+  });
+
+  it('should generate consecutive IDs across different prefix types', () => {
+    expect(uniqueId('prefix_')).toBe('prefix_6');
+    expect(uniqueId()).toBe('7');
+    expect(uniqueId('another_')).toBe('another_8');
+  });
+});

src/compat/util/uniqueId.ts

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+import { toString } from './toString';
+
+/** Counter used to generate unique numeric identifiers. */
+let idCounter = 0;
+
+/**
+ * Generates a unique identifier, optionally prefixed with a given string.
+ *
+ * This function increments an internal counter to ensure uniqueness within
+ * the current session. If a prefix is provided, it is prepended to the
+ * generated identifier.
+ *
+ * @param {string} [prefix] - An optional string to prefix the unique identifier.
+ *                            If not provided or not a string, only the unique
+ *                            numeric identifier is returned.
+ * @returns {string} A string containing the unique identifier, with the optional
+ *                   prefix if provided.
+ *
+ * @example
+ * // Generate a unique ID with a prefix
+ * uniqueId('user_');  // => 'user_1'
+ *
+ * @example
+ * // Generate a unique ID without a prefix
+ * uniqueId();  // => '2'
+ *
+ * @example
+ * // Subsequent calls increment the internal counter
+ * uniqueId('item_');  // => 'item_3'
+ * uniqueId();         // => '4'
+ */
+export function uniqueId(prefix?: string): string {
+  const id = ++idCounter;
+
+  return toString(prefix) + id;
+}