Toy Robot

Instructions

This is a program that simulates a Toy Robot moving on a table top. The table top is a grid of 5 units x 5 units. There are no obstructions on the table surface. The Toy Robot is free to roam around the surface of the table, but must be prevented from falling to destruction. A failed or invalid command should not stop the simulation.

• PLACE X,Y,F will place the Toy Robot on the table at position X,Y and facing direction F.
  • Direction can be one of the cardinal points: NORTH, EAST, SOUTH or WEST.
• MOVE will move the Toy Robot one unit forward in the direction it is currently facing.
• LEFT will rotate the Toy Robot 90 degrees left (anti-clockwise/counter-clockwise).
• RIGHT will rotate the Toy Robot 90 degrees right (clockwise).
• REPORT will announce the X,Y,F of Toy Robot.
• Every command should provide visual output that the command has either succeeded or failed (display fail messages).

Assumptions

• Successful commands are upper case (lower case letters would result fail).
• Allow empty space before/after commands (e.g. REPORT or PLACE 1,1,NORTH result success).
• Do not allow empty space between position X,Y,F (e.g. PLACE ,,NORTH will result fail).
• Origin (0,0) to be the SOUTH WEST most corner.
• Inputs are from standard input.
• Ignore any move that would cause the robot to fall and fail (remain the same state).
• Discard all commands in the sequence until a valid PLACE command has been executed.
• Current version installed
  • npm: 10.2.4
  • node: 20.11.0
  • git: 2.39.2 (Apple Git-143)

Constraints

The first valid command must be PLACE. After that, any sequence of commands may be issued in any order, including another PLACE command.

Example Input and Output

Example A

Input:

PLACE 0,0,NORTH
MOVE
REPORT

Output:

0,1,NORTH

Example B

Input:

PLACE 0,0,NORTH
LEFT
REPORT

Output:

0,0,WEST

Example C

Input:

PLACE 1,2,EAST
MOVE
MOVE
LEFT
MOVE
REPORT

Output:

3,3,NORTH

Setup

Make sure you have the latest git, Node.js and Npm installed on your machine

$ git --version
$ npm --version
$ node --version

Clone the repo from Github

git clone https://github.com/LEO0331/ToyRobot.git

Install dependencies with npm install in the ToyRobot folder

npm install

Run tests

npm run test

Run prettier

npx prettier . --write

Start the simulator

npm run start or npm start

Paste your input followed by Enter

PLACE 0,0,NORTH -> type Enter
MOVE -> type Enter
REPORT -> type Enter then the result will show

Exit the simulator

Ctrl + C or Cmd + C to terminate the simulator