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}.
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.
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.
To run the specs follow these commands:
#to run in the browser
learn -bWhen you finish passing a test, remove the x from xit to convert it to a runnable test.
View Robot Simulator on Learn.co and start learning to code for free.