7.1 Measuring a robot (Eloquent JavaScript Solutions)

7-1 Eloquent Javascript Solutions.js

function runRobot(state, robot, memory) {
  for (let turn = 0;; turn++) {
    if (state.parcels.length == 0) {
      return turn;
    }
    let action = robot(state, memory);
    state = state.move(action.direction);
    memory = action.memory;
  }
}

function compareRobots(robot1, memory1, robot2, memory2) {
  let totalIterations = 100;
  let robot1Results = [];
  let robot2Results = [];
  for (let i = 0; i < totalIterations; i++) {
    let state = VillageState.random();
    robot1Results.push(runRobot(state, robot1, memory1));
    robot2Results.push(runRobot(state, robot2, memory2));
  }
  let r1a = Math.floor(robot1Results.reduce((a, c) => a + c, 0) / robot1Results.length + 0.5);
  let r2a = Math.floor(robot2Results.reduce((a, c) => a + c, 0) / robot2Results.length + 0.5);
  console.log(`Route Robot completed in an avarage of ${r1a} turns.`);
  console.log(`Goal Oriented Robot completed in an avarage of ${r2a} turns.`);
}

compareRobots(routeRobot, [], goalOrientedRobot, []);

Hints

You’ll have to write a variant of the runRobot function that, instead of logging the events to the console, returns the number of steps the robot took to complete the task.

Your measurement function can then, in a loop, generate new states and count the steps each of the robots takes. When it has generated enough measurements, it can use console.log to output the average for each robot, which is the total amount of steps taken divided by the number of measurements.