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The application is a simulation of a toy robot moving on a square tabletop, of dimensions 5x5. Having a CLI option and also a web version.
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There are no other obstructions on the table surface.
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The robot is free to roam around the surface of the table, but must be prevented from falling to destruction. Any movement that would result in the robot falling from the table must be prevented, however further valid movement commands must still be allowed.
Create an application that can read in commands of the following form:
PLACE X,Y,F
MOVE
LEFT
RIGHT
REPORT
-
PLACE
will put the toy robot on the table in position X,Y and facing NORTH, SOUTH, EAST or WEST. -
The origin (0,0) can be considered to be the NORTH WEST most corner.
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The first valid command to the robot is a
PLACE
command, after that, any sequence of commands may be issued, in any order, including anotherPLACE
command. The application should discard all commands in the sequence until a validPLACE
command has been executed -
MOVE
will move the toy robot one unit forward in the direction it is currently facing. -
LEFT
andRIGHT
will rotate the robot 90 degrees in the specified direction without changing the position of the robot. -
REPORT
will announce the X,Y and F of the robot. This can be in any form, but standard output is sufficient. -
A robot that is not on the table can choose to ignore the
MOVE
,LEFT
,RIGHT
andREPORT
commands. -
Inputs could be from a file or STDIN, as the developer chooses.
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Provide test data to exercise the application.
You have to create a simple (no complex layout needed) web application, showing the table and the position and direction of the robot on the table (if robot already placed on table). All commands must update robot position, in other words, the command's output should be visible on the table, invalidating the necessity of the REPORT
command.
You are free to decide how to receive commands, being it in batches or individually, but the commands must be "processed" individually. Meaning all commands must update the robot position on the table in a way the user can understand the path the robot is following.
- All commands (except
REPORT
which is unnecessary for the Web Version) should work exactly as on the CLI.
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The toy robot must not fall off the table during movement. This also includes the initial placement of the toy robot.
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Any move that would cause the robot to fall must be ignored.
PLACE 0,0,SOUTH
MOVE
REPORT
Expected output:
0,1,SOUTH
PLACE 0,0,SOUTH
LEFT
REPORT
Expected output:
0,0,EAST
PLACE 1,2,EAST
MOVE
MOVE
RIGHT
MOVE
REPORT
Expected output
3,3,SOUTH
Please provide your source code, and any test code/data you used to build your solution.
Please engineer your solution to a standard you consider suitable for production. It is not required to provide any graphical output showing the movement of the toy robot on the CLI, only on the web.
Make sure you have Ruby 2.4.1 installed in your machine.
Install the dependencies with bundle
and make sure you have Redis running as well.
Ps: I've used Redis instead of ActiveRecord to persist data between requests
Run the server rails s
Visit http://localhost:3000
Type the commands ;) (ex: place 1,2,south
, move
, left
, right
).
Run bin/rails runner lib/cli.rb
to start the cli
Type the commands (same as above, including report
)
Ps: you need to use bin/rails runner
to load rails, a better approach would be to extract the core classes to a gem and have a separate bundle for the cli
You can also run using Docker.
Run the docker process then start the services:
docker-compose up
Visit http://localhost:3001
(not 3000)
You can run the tests with:
bundle exec rspec