---
schema_version: "1"
id: fb1b6599991e367d5b0eb48f2cd485f69bc19a51a20fab94b33f17adca6228c4
title: isFunctionType
collection: mulesoft
version: current
locale: en-us
portal_url: https://docs.salesforce.com/mulesoft/current/en-us/dataweave/2.11/dw-types-functions-isfunctiontype.md
canonical_url: https://docs.mulesoft.com/dataweave/2.11/dw-types-functions-isfunctiontype
source_site: docs.mulesoft.com
content_type: documentation
content_hash: 49cc9b55efe7096604911b8af2d5b2e37f1fe9d3576afd2f50f6387770842843
description: MuleSoft Documentation Site
release: "2.11"
latest: false
---
---
product: DataWeave
version: 2.11
---

# isFunctionType

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## isFunctionType(t: Type): Boolean

Returns `true` if the input is the Function type.

_Introduced in DataWeave version 2.3.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>t</code></p></td><td><p>The type to check.</p></td></tr></tbody></table>

### Example

This example shows how `isFunctionType` behaves with different inputs.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Types
type AFunction = (String) -> String
output application/json
---
{
   a: isFunctionType(AFunction),
   b: isFunctionType(Boolean)
}
```

#### Output

```Json
{
  "a": true,
  "b": false
}
```