---
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title: isFunctionType
collection: mulesoft
version: current
locale: en-us
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canonical_url: https://docs.mulesoft.com/dataweave/2.12/dw-types-functions-isfunctiontype
source_site: docs.mulesoft.com
content_type: documentation
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description: MuleSoft Documentation Site
release: "2.12"
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---
---
product: DataWeave
version: 2.12
---

# 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
}
```