<itemvalue="Shuffles the elements of this list randomly. ```dart final numbers = <int>[1, 2, 3, 4, 5]; numbers.shuffle(); print(numbers); [1, 3, 4, 5, 2] OR some other random result. ```"/>
<itemvalue="_Labels Pattern"/>
<itemvalue="fling"/>
<itemvalue="If `test` returns `true`, [onError] is called with the error and possibly stack trace, and the returned future is completed with the result of this call in exactly the same way as for [then]'s `onError`. If `test` is omitted, it defaults to a function that always returns true. The `test` function should not throw, but if it does, it is handled as if the `onError` function had thrown. Note that futures don't delay reporting of errors until listeners are added. If the first `catchError` (or `then`) call happens after this future has completed with an error then the error is reported as unhandled error. See the description on [Future]."/>