I'm new to docker, just started learning it and I am trying to run a simple node application with an expression, but I get this error:

Here is my working directory:

I ran the following command to set my current source code directory to /var/www
inside the node container and start node npm to start the application; but I get the error above and not sure what to do:
docker run -p 8085:3000 -v /home/joel/workspace/plural_docker_webdev:/var/www node -w "/var/www" node npm start
And I get this error:
docker: Error response from daemon: OCI runtime create failed: container_linux.go:296: starting container process caused "exec: \"-w\": executable file not found in $PATH": unknown.
ERRO[0000] error waiting for container: context canceled
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