orElseTry

orElseTry<T, R>(previous: TryResult<T>, orElse: () -> R): TryResult<T | R>

Function to use with try to chain multiple try requests.

Introduced in DataWeave: 2.2.0.

Parameters

Name Description

previous

Result from a previous call to try.

orElseTry

Argument to try if the previous argument fails.

Example

This example waits shows how to chain different try

Source

%dw 2.0
import * from dw::Runtime
var user = {}
var otherUser = {}
output application/json
---
{
    a: try(() -> user.name!) orElseTry otherUser.name!,
    b: try(() -> user.name!) orElseTry "No User Name"
}

Output

{
  "a": {
    "success": false,
    "error": {
      "kind": "KeyNotFoundException",
      "message": "There is no key named 'name'",
      "location": "\n9|     a: try(() -> user.name!) orElseTry otherUser.name!,\n                                          ^^^^^^^^^^^^^^",
      "stack": [
        "main (org::mule::weave::v2::engine::transform:9:40)"
      ]
    }
  },
  "b": {
    "success": true,
    "result": "No User Name"
  }
}

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