[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Object](https://evolu.dev/docs/api-reference/common/Object) › isFunction

```ts
function isFunction(value: unknown): value is Function;
```

Defined in: [packages/common/src/Object.ts:58](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Object.ts#L58)

Checks if a value is a function.

### Example

```ts
isFunction(() => {}); // true
isFunction(function () {}); // true
isFunction({}); // false
```