greeting-kata - from raphael251

This Kata was extracted from here and I just paste it below to make it easy to understand when someone wants to clone this repo and see what I did.

I found this Kata in a this Medium article, where are some others Katas for practicing if you are interested.

The purpose of this repo is just to practice some of TDD and "progressive development". I know there are still improvements to be made and test cases that are not yet covered. Maybe I i'll come back to fill them.

Running the test cases

To run the test cases you just have to:

1. Clone this repo
2. run the yarn command
3. run the yarn test command

The Greeting Kata

This Kata is designed to help practice how a test of a pure function ought to look. It is intentionally designed to start with a very easy, non-branching base case which slowly becomes addled with complexity as additional requirements are added that will require significant branching and eventually a pressure to compose additional units.

This Kata was suggested by Nick Gauthier and inspired a bit by Bob from Exercism.

This Kata is designed to be used with [[Detroit-school TDD]].

Requirement 1

Write a method greet(name) that interpolates name in a simple greeting. For example, when name is "Bob", the method should return a string "Hello, Bob.".

Requirement 2

Handle nulls by introducing a stand-in. For example, when name is null, then the method should return the string "Hello, my friend."

Requirement 3

Handle shouting. When name is all uppercase, then the method should shout back to the user. For example, when name is "JERRY" then the method should return the string "HELLO JERRY!"

Requirement 4

Handle two names of input. When name is an array of two names (or, in languages that support it, varargs or a splat), then both names should be printed. For example, when name is ["Jill", "Jane"], then the method should return the string "Hello, Jill and Jane."

Requirement 5

Handle an arbitrary number of names as input. When name represents more than two names, separate them with commas and close with an Oxford comma and "and". For example, when name is ["Amy", "Brian", "Charlotte"], then the method should return the string "Hello, Amy, Brian, and Charlotte."

Requirement 6

Allow mixing of normal and shouted names by separating the response into two greetings. For example, when name is ["Amy", "BRIAN", "Charlotte"], then the method should return the string "Hello, Amy and Charlotte. AND HELLO BRIAN!"

Requirement 7

If any entries in name are a string containing a comma, split it as its own input. For example, when name is ["Bob", "Charlie, Dianne"], then the method should return the string "Hello, Bob, Charlie, and Dianne.".

Requirement 8

Allow the input to escape intentional commas introduced by Requirement 7. These can be escaped in the same manner that CSV is, with double quotes surrounding the entry. For example, when name is ["Bob", "\"Charlie, Dianne\""], then the method should return the string "Hello, Bob and Charlie, Dianne.".