- Open your command-line application and navigate to your workspace.
- Copy the 09-02-assembling-instances-with-builders folder to a new 09-04-processing-a-structure-with-the-visitor-pattern directory.
- Add a class named MissionInspector to main.js. Create a visitor method that calls a corresponding method for each of the following types: Mission, Destination, Rocket, and Payload:
// main.js /* visitor that inspects mission */ class MissionInspector { visit (element) { if (element instanceof Mission) { this.visitMission(element); } else if (element instanceof Destination) { this.visitDestination(element); } else if (element instanceof Rocket) { this.visitRocket(element); } else if (element instanceof Payload) { this.visitPayload(element); ...
