If you run the app directly without cli input, it will take example input from the "resources/example-commands.txt".
If you want to provide a custom file, you can use the --inputFile parameter
Example:
go run main.go --inputFile="resources/example-commands-cmd.txt"
It was not clear from the task what should happen with the rover if the boundaries of the Grid are reached
- One option is to block execution and exit with error
- Other is to continue processing without allowing the rover to exit the boundaries
- There could be error handling for such situations
In real world scenario those should be clarified with the Project Owner to match the Business needs. In this case I decided to just continue with the second option.
Also there isn't specific requirement for unit testing - those I added following up on our initial interview. Some of the functions are not unit tested because they are composed from already covered blocks.
No specific actions were outlined in the task when validation fails. Here again this can be debated with the project owner. I've decided to handle them by default with standard error throwing.
A squad of robotic rovers are to be landed by NASA on a plateau on Mars.
This plateau, which is curiously rectangular, must be navigated by the rovers so that their on-board cameras can get a complete view of the surrounding terrain to send back to Earth.
A rover's position is represented by a combination of an x and y co-ordinates and a letter representing one of the four cardinal compass points.
The plateau is divided up into a grid to simplify navigation. An example position might be 0, 0, N, which means the rover is in the bottom left corner and facing North.
To control a rover, NASA sends a simple string of letters. The possible letters are 'L', 'R' and 'M'. 'L' and 'R' makes the rover spin 90 in each direction degrees left or right respectively, without moving from its current spot.
'M' means move forward one grid point and maintain the same heading.
Assume that the square directly North from (x, y) is (x, y+1).
The first line of input is the upper-right coordinates of the plateau, the lower-left coordinates are assumed to be 0,0.
The rest of the input is information pertaining to the rovers that have been deployed. Each rover has two lines of input. The first line gives the rover's position, and the second line is a series of instructions telling the rover how to explore the plateau.
The position is made up of two integers and a letter separated by spaces, corresponding to the x and y co-ordinates and the rover's orientation.
Each rover will be finished sequentially, which means that the second rover won't start to move until the first one has finished moving.
Input is provided via a formatted text file.
5 5
1 2 N
LMLMLMLMM
3 3 E
MMRMMRMRRM
The output for each rover should be its final co-ordinates and heading.
Assuming the example input is given, the output is:
1 3 N
5 1 E