feat(isSet): add isSet

benchmarks/performance/isSet.bench.ts

@@ -0,0 +1,21 @@
+import { bench, describe } from 'vitest';
+import { isSet as isSetToolkit } from 'es-toolkit';
+import { isSet as isSetLodash } from 'lodash';
+
+describe('isSet', () => {
+  bench('es-toolkit/isSet', () => {
+    isSetToolkit(new Set());
+    isSetToolkit(new WeakSet());
+    isSetToolkit([]);
+    isSetToolkit({});
+    isSetToolkit(null);
+  });
+
+  bench('lodash/isSet', () => {
+    isSetLodash(new Set());
+    isSetLodash(new WeakSet());
+    isSetLodash([]);
+    isSetLodash({});
+    isSetLodash(null);
+  });
+});

docs/ko/reference/predicate/isSet.md

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+# isSet
+
+주어진 값이 `Set`의 인스턴스인지 확인해요.
+
+값이 `Set`이면 `true`, 아니면 `false`를 반환해요.
+
+TypeScript의 타입 가드로 주로 사용되는데요, 파라미터로 주어진 값을 `Set`인 타입으로 좁힐 수 있어요.
+
+## 인터페이스
+
+```typescript
+function isSet(value: unknown): value is Set<any>;
+```
+
+### 파라미터
+
+- `value` (`unknown`): `Set`인지 확인할 값.
+
+### 반환 값
+
+(`value is Set<any>`): 값이 `Set`이면 `true`, 아니면 `false`.
+
+## 예시
+
+```typescript
+const value1 = new Set();
+const value2 = new Map();
+const value3 = new WeakSet();
+
+console.log(isSet(value1)); // true
+console.log(isSet(value2)); // false
+console.log(isSet(value3)); // false
+```

docs/reference/predicate/isSet.md

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+# isSet
+
+Checks if the given value is a `Set`.
+
+This function tests whether the provided value is an instance of `Set`.
+It returns `true` if the value is a `Set`, and `false` otherwise.
+
+This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to `Set`.
+
+## Signature
+
+```typescript
+function isSet(value: unknown): value is Set<any>;
+```
+
+### Parameters
+
+- `value` (`unknown`): The value to check if it is a `Set`.
+
+### Returns
+
+(`value is Set<any>`): true if the value is a `Set`, false otherwise.
+
+## Examples
+
+```typescript
+const value1 = new Set();
+const value2 = new Map();
+const value3 = new WeakSet();
+
+console.log(isSet(value1)); // true
+console.log(isSet(value2)); // false
+console.log(isSet(value3)); // false
+```

src/predicate/index.ts

@@ -14,5 +14,6 @@ export { isRegExp } from './isRegExp.ts';
 export { isBoolean } from './isBoolean.ts';
 export { isSymbol } from './isSymbol.ts';
 export { isString } from './isString.ts';
+export { isSet } from './isSet.ts';
 export { isWeakMap } from './isWeakMap.ts';
 export { isWeakSet } from './isWeakSet.ts';

src/predicate/isSet.spec.ts

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+import { describe, expect, it } from 'vitest';
+import { isSet } from './isSet';
+
+describe('isSet', () => {
+  it('returns true if the value is a Set', () => {
+    expect(isSet(new Set())).toBe(true);
+  });
+
+  it('returns false if the value is not a Set', () => {
+    expect(isSet(null)).toBe(false);
+    expect(isSet('')).toBe(false);
+    expect(isSet(123)).toBe(false);
+    expect(isSet({})).toBe(false);
+    expect(isSet([])).toBe(false);
+    expect(isSet(new Map())).toBe(false);
+    expect(isSet(new WeakSet())).toBe(false);
+  });
+});

src/predicate/isSet.ts

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+/**
+ * Checks if a given value is `Set`.
+ *
+ * This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to `string`.
+ *
+ * @param {unknown} value The value to check if it is a `Set`.
+ * @returns {value is Set<any>} Returns `true` if `value` is a `Set`, else `false`.
+ *
+ * @example
+ * const value1 = new Set();
+ * const value2 = new Map();
+ * const value3 = new WeakSet();
+ *
+ * console.log(isSet(value1)); // true
+ * console.log(isSet(value2)); // false
+ * console.log(isSet(value3)); // false
+ */
+
+export function isSet(value: unknown): value is Set<any> {
+  return value instanceof Set;
+}