Robot Simulator

Background

Step 1

The robot factory manufactures robots that have three possible movements:

• turn right
• turn left
• advance

Robots are placed on a hypothetical infinite grid, facing a particular direction (north, east, south, or west) at a set of [x, y] coordinates, e.g. [3,8].

Step 2

The factory's test facility needs a program to verify robot movements.

There are a number of different rooms of varying sizes, measured in Robot Units, the distance a robot moves when you instruct it to advance.

The floor of the room is a grid, each square of which measures 1 square RU (Robot Unit).

The rooms are always oriented so that each wall faces east, south, west, and north.

The test algorithm is to place a robot at a coordinate in the room, facing in a particular direction.

The robot then receives a number of instructions, at which point the testing facility verifies the robot's new position, and in which direction it is pointing.

Step 3

The robot factory's test facility has a simulator which can take a string of letters and feed this into a robot as instructions.

• The letter-string "RAALAL" means:
  • Turn right
  • Advance twice
  • Turn left
  • Advance once
  • Turn left yet again
• Say a robot starts at [7, 3] facing north.

Then running this stream of instructions should leave it at [9, 4] facing west.

Tests

To run the specs follow these commands:

learn

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