functionReturnType

functionReturnType(Type): Type | Null

Returns the type of a function’s return type. This function fails if the input type is not a Function type.

Introduced in DataWeave 2.3.0. Supported by Mule 4.3 and later.

Parameters

Name	Description
t	The function type.

Example

This example shows how functionReturnType behaves with different inputs.

Source

%dw 2.0
output application/json
import * from dw::core::Types
type AFunction = (String, Number) -> Number
type AFunction2 = () -> Number
---
{
    a: functionReturnType(AFunction),
    b: functionReturnType(AFunction2)
}DataWeave

Output

 {
    "a": "Number",
    "b": "Number"
  }Json