Elevator Simulator kata

An elevator simulator, done as a coding exercise emphasising TDD and Object Oriented design principles.

Running the simulation

bin/simulate

The simulate script has some preset instructions that get added at each pause and exercise the elevator control code.

Running the tests

• Clone the repository
• Run bundle to install RSpec and Simplecov
• Run bundle exec rspec
• Optionally... Browse the test coverage results by opening coverage/index.html after running the tests.

About

The simulation runs a run loop where each tick creates a new ShaftState object. Each successive tick creates a new object and leaves past state objects intact (immutability has advantages).

The RunLoop and InstructionResolver resolve which instruction to take action on next based on the direction of movement of the elevator and distance to the target floor. In the case of a pickup request is also factors in the requested direction of travel after the pickup.