Lets say we have a list of jobs and certain jobs must be printed before others, a job may have a dependency on another job. For example, a may depend on b, meaning the final sequence of jobs should place b before a. If a has no dependency, the position of a in the final sequence does not matter.
Input data will be in a specific format i.e. each line will have a job then => dependency indicator and then another job. Here are few examples:
a =>
result should be a sequence consisting of a single job, e.x. ["a"]
a =>
b =>
c =>
result should be a sequence containing all three jobs a b c in no significant order, e.x. ["a", "b", "c"]
a =>
b => c
c => f
d => a
e => b
f =>
result should be a sequence that positions f before c, c before b, b before e and a before d containing all six jobs e.x. ["a", "f", "c", "b", "d", "e"]
a =>
b =>
c => c
result should be an error stating that jobs can’t depend on themselves
a =>
b => c
c => f
d => a
e =>
f => b
result should be an error stating that jobs can’t have circular dependencies
This program requires ruby and bundler to be installed. Before you begin; install the dependencies by running:
bundle install
To start it the program write:
bin/jobs_list
Will attempt to run the application and print output to the terminal. We have a inputs directory at root level where there are some sample input files are added and used in the runner script. Feel free use new input files and use them in runner script i.e. bin/jobs_list
To run test cases write:
bundle exec rspec