README.md

Setup

• Clone this repository, git clone git@github.com:Razenghan/coding-exercise.git

  -- OR --

• Download and unzip from https://github.com/Razenghan/coding-exercise/archive/release-0.1.zip

Running the console command

Console program is written in Ruby

1. Execute ruby check_additive.rb
2. Enter an integer. The program will perform the following:

• Defines a method (actually, a Proc) called secret, which returns a linear function
• Finds all prime numbers less than your input
• For each prime number combination (x,y), evaluates secret(x) + secret(y) == secret(x+y)

• If all combinations (x,y) satisfies the above condition, the program prints true
• If any combination (x,y) does not satisfy the above condition, the program prints false

Running the test

A test is provided, written in RSpec. The console command above only implements the 'secret' method once, with a linear function that is always additive. This test covers both linear and non-linear implementations, which are additive / non-additive, respectively

1. Install RSpec and its dependencies, if needed: gem install rspec
2. Execute rspec spec/check_additive_spec.rb The test asserts the following:

• When a secret method is linear, AdditiveMethodValidator#is_method_additive? should be TRUE for any prime numbers
• When a secret method is non-linear, AdditiveMethodValidator#is_method_additive? should be FALSE for all prime numbers