mars-rover-solution.js

const myRover = {
  // position is an array of 2 elements -> first element is x and the second element is y
  position: [0,0],
  direction: 'N',
  roverDirections: ['N', 'E', 'S', 'W'],
  theCommands: ['f', 'b', 'l', 'r']
};

const theCommands = prompt ("Insert the instruction: ");

// function definition:
function commandsArray(myRover){
  for (let i=0; i<theCommands.length; i++){
    if (theCommands[i] === "f") {
      goForward(myRover);
    } else if (theCommands[i] === "b"){
      goBackward(myRover);
    } else if (theCommands[i] === "l"){
      turnLeft(myRover);
    } else if (theCommands[i] ==='r'){
      turnRight(myRover);
    }
  }
  console.log(`New Rover Position: [${myRover.position[0]},  ${myRover.position[1]}]`);
  console.log(`New Rover Direction: ${myRover.direction}`);
}

// invoke a function:
commandsArray(myRover);

// function definition:
function goForward(myRover) {
  switch(myRover.direction) {
    case 'N':
      myRover.position[0]++;
      break;
    case 'E':
      myRover.position[1]++;
      break;
    case 'S':
      myRover.position[0]--;
      break;
    case 'W':
      myRover.position[1]--;
      break;
  }
}

// invoke a function:
goForward(myRover);


function goBackward(myRover) {
  switch(myRover.direction) {
    case 'N':
      myRover.position[0]--;
      break;
    case 'E':
      myRover.position[1]--;
      break;
    case 'S':
      myRover.position[0]++;
      break;
    case 'W':
      myRover.position[1]++;
      break;
  }
  console.log(`New Rover Position: [${myRover.position[0]},  ${myRover.position[1]}]`);
  console.log(`New Rover Direction: ${myRover.direction}`);
}

goBackward(myRover);


function turnLeft(myRover){
  switch (myRover.direction) {
    case 'N':
      myRover.direction = 'W';
    break;
    case 'E':
      myRover.direction = 'N';
    break;
    case 'S':
      myRover.direction = 'E';
    break;
    case 'W':
      myRover.direction = 'S';
    break;
        }
    console.log(`New Rover Position: [${myRover.position[0]},  ${myRover.position[1]}]`);
    console.log(`New Rover Direction: ${myRover.direction}`);
}

turnLeft(myRover);


function turnRight(myRover){
  switch (myRover.direction) {
    case 'N':
      myRover.direction = 'E';
    break;
    case 'E':
      myRover.direction = 'S';
    break;
    case 'S':
      myRover.direction = 'W';
    break;
    case 'W':
      myRover.direction = 'N';
    break;
  }
  console.log(`New Rover Position: [${myRover.position[0]},  ${myRover.position[1]}]`);
  console.log(`New Rover Direction: ${myRover.direction}`);
}

turnRight(myRover);