isSet (Lodash Compatibility)

Use es-toolkit's isSet instead

This isSet function is a Lodash compatibility function, but has the same implementation as the main library.

Use the faster and more modern es-toolkit's isSet instead.

Checks if a value is a Set.

const result = isSet(value);

Reference

isSet(value)

Use isSet when you want to type-safely check if a value is a Set. It also works as a type guard in TypeScript.

import { isSet } from 'es-toolkit/compat';

// Set checking
const set = new Set();
isSet(set); // true

// Other types return false
isSet(new Map()); // false
isSet(new WeakSet()); // false
isSet([]); // false
isSet({}); // false
isSet('set'); // false
isSet(123); // false
isSet(null); // false
isSet(undefined); // false

It also distinguishes from other similar collections.

import { isSet } from 'es-toolkit/compat';

// Set vs Map vs WeakSet
isSet(new Set([1, 2, 3])); // true
isSet(new Map([['key', 'value']])); // false
isSet(new WeakSet()); // false

// Set vs array
isSet(new Set([1, 2, 3])); // true
isSet([1, 2, 3]); // false

// Set vs regular objects
isSet(new Set()); // true
isSet({}); // false
isSet(Object.create(null)); // false

Parameters

• value (unknown): The value to check if it's a Set.

Returns

(value is Set<any>): Returns true if the value is a Set, false otherwise.