description

# Timer constructor

Timer(

1. Duration duration,
2. void callback()

)

Creates a new timer.

The `callback` function is invoked after the given `duration`.

Example:

    final timer =
        Timer(const Duration(seconds: 5), () => print('Timer finished'));
    // Outputs after 5 seconds: "Timer finished".

## Implementation

    factory Timer(Duration duration, void Function() callback) {
      if (Zone.current == Zone.root) {
        // No need to bind the callback. We know that the root's timer will
        // be invoked in the root zone.
        return Zone.current.createTimer(duration, callback);
      }
      return Zone.current.createTimer(
        duration,
        Zone.current.bindCallbackGuarded(callback),
      );
    }