Recent Files Tracker

recent.md

Let's build a Recent File Tracker

• Implement a Class, name it RecentFiles

• You can start implementing your class from 2nd line onwards.

• You can run the test code, which will test your code using the following command: rspec file_name.rb

• You can replace the file_name.rb with your actual file which you are working with.

• If you get any errors such as rspec not found etc, please do: sudo gem install rspec

• The class should be able to handle the following scenarios:

  • Output a list of most recent accessed files.
  • If a file with same name is accessed multiple times, your list should include or consider it only once.
  • Your list should keep track of only most recent 5 files.
  • The most recent file should be on top of the list OR first element in your list
  • Here's how the code API should look like:

class RecentFiles
 # your code here
end

recent = RecentFiles.new([])
or
recent = RecentFiles.new(['file1', 'file2'])

recent.add('filename') # this file should go to the top of the list

recent.files # this should give you ['filename', 'file1', 'file2']

recent_files_spec.rb

require 'rspec'

describe RecentFiles do

  describe '#initialize' do

    it 'can be initialized with an empty list' do
      recent = RecentFiles.new([])
      expect(recent.files)to  eq([])
    end

    it 'cannot be initialized without a list of file names' do
      expect { recent = RecentFiles.new }.to raise_error
    end

    it 'can be initialized with less than 5 files' do
      file_list = [1,2,3,4]
      recent = RecentFiles.new(file_list)
      expect(recent.files).to eq(file_list)
    end

    it 'can contain maximum 5 files only/1st five' do
      file_list = [1,2,3,4,5,6]
      recent = RecentFiles.new(file_list)
      expect(recent.files).to eq(file_list[0..4])
    end

  end

  describe '#list' do

    it 'should return the list of the files' do
      file_list = ['file1', 'file2', 'file3']
      recent = RecentFiles.new(file_list)
      expect(recent.files).to eq(file_list)
    end

    it 'should return the running list' do
      recent = RecentFiles.new(['file1', 'file2', 'file3'])
      recent.add('file4')
      recent.add('file5')
      expect(recent.files).to eq(['file5', 'file4', 'file1', 'file2', 'file3'])
    end

  end


  describe '#add' do

    it 'should be able to add files to the list' do
      recent = RecentFiles.new([])
      recent.add('filename')
      expect(recent.files).to include('filename')
    end

    it 'cannot contain duplicates' do
      recent = RecentFiles.new([])
      recent.add('filename')
      recent.add('filename')
      expect(recent.files).to eq(['filename'])
    end

  end

end