Four code examples are available:

1. [`/helloworld/`](https://github.com/grpc/grpc-dart/tree/master/example/helloworld):
   A demonstration of using the Dart gRPC library to perform unary RPs.

1. [`/googleapis/`](https://github.com/grpc/grpc-dart/tree/master/example/googleapis):
   A demonstration of using the Dart gRPC library to communicate with Google APIs.

1. [`/metadata/`](https://github.com/grpc/grpc-dart/tree/master/example/metadata):
   A demonstration of how to handle custom metadata, cancellation, and timeouts in Dart gRPC.

1. [`/route_guide/`](https://github.com/grpc/grpc-dart/tree/master/example/route_guide):
   A demonstration of how to perform unary, client streaming, server streaming and full duplex RPCs.

For a complete, step-wise working example, see the [Dart gRPC Quickstart](https://grpc.io/docs/quickstart/dart.html).