irkka/numberphile

A function library to test fun properties of integers

numberphile's Issues

Create #isGrafting function

DoD

• add definition to grafting numbers
• public function #isGrafting is present
• private helper functions
• end-to-end testing

Implement shared behaviour in test suite

Now the test suite is just a mess of copy-paste and already resulted in one invalid test.

DoD

• all functions should test for validity in the same way; and on exceptions the exceptional functions should be further grouped together

Create #isHappy function

A number is happy, if a recursive squaring and summing up of its constituent characters leads to 1. If the number creates a neverending cycle, then it's consequently unhappy.

DoD

• a public function to test the happiness of an integer
• a private function to crunch the numbers
• end-to-end testing

Create #isNarcissistic function

DoD

• add definition to narcissistic numbers
• end-to-end testing
• public function #isNarcissistic is present – returns a boolean value
• private helper functions