# Future<T> constructor

Future<T>(FutureOr<T> computation())

Creates a future containing the result of calling `computation` asynchronously with Timer.run.

If the result of executing `computation` throws, the returned future is completed with the error.

If the returned value is itself a Future, completion of the created future will wait until the returned future completes, and will then complete with the same result.

If a non-future value is returned, the returned future is completed with that value.

## Implementation

    factory Future(FutureOr<T> computation()) {
      _Future<T> result = new _Future<T>();
      Timer.run(() {
        try {
          result._complete(computation());
        } catch (e, s) {
          _completeWithErrorCallback(result, e, s);
        }
      });
      return result;
    }