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failIf

failIf(T, (value: T) -> Boolean, String): T

Produces a failure with the specified message if the expression in the evaluator returns true. If not true, returns the value.

Parameters

Name Description

value

The value to return only if the evaluator expression is false.

evaluator

Expression that returns true or false.

Example

This example produces a failure (instead of a { "result": "SUCCESS" } message) because the expression isEmpty(empty) is true. The empty variable defines an empty object.

Source

%dw 2.0
import failIf from dw::Runtime
var empty = {}
var notEmpty = { "a" : "b" }
output application/json
---
{ "result" : "SUCCESS" failIf (isEmpty(empty)) }

Output

Failed
Trace:
  at fail (Unknown)
  at dw::Runtime::failIf (line: 97, column: 26)
  at main (line: 7, column: 24)

In the Studio console component, the output looks something like this:

ERROR 2018-07-29 11:56:39,988 ...
**********************************
Message               : "Failed

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