Collatz Sequence

Solution and Tests to the Columbia University

Project structure

• lib/collatz_sequence.rb - contains solution
• spec/collatz_sequence_spec.rb - includes tests

Solution

• The method determine_collatz_sequence accepts as an argument number n and returns and an array with a sequence.
• The method determine_collatz_sequence_print accepts as an argument an array witha a sequence and prints it in a console.
• The method collect_all_collatz_sequences_length_for accepts as an argument number n and returns an array of hashes where hash is a single key - value pair. Key is n - number and value is a length of the sequence.
• The method find_the_longest_sequence accepts as an argument an array with hashes and returns an array with two elements. The first element is a n - number and the second a length of the sequence.

Test execution

• Run bundle install
• Open terminal window
• From the project directory run rspec