# isFunction

# Function: isFunction()

```ts
function isFunction<T>(d): d is T;
```

Defined in: [utils.ts:32](https://github.com/TanStack/table/blob/main/packages/table-core/src/utils.ts#L32)

## Type Parameters

### T

`T` *extends* `AnyFunction`

## Parameters

### d

`any`

## Returns

`d is T`