MonkeyAndres / crazy-ranges-kata

Implement a special range generator and a range shrinker.

CrazyRanges Kata

In this kata you'll be implementing a range generator and a range parser. Sound easy huh? Well, we're not talking about normal ranges, the ranges in this kata are special. We can have 3 types of range components:

• Simple numbers: 1, 2, 3, 4, 5...
• Numbers prefixed with a single letter: A1, A2, A3, C1, C2, C3...
• Numbers suffixed with a single letter: 1A, 2A, 3A, 1C, 2C, 3C...

Also the ranges follow some special rules:

• Ranges are always a group of 2 of the previous components joined by a - character
• They can only be formed with same type components. E.g. A1-B3, 1A-3B
• Ranges are going to contain max 1 letter either suffix or prefix but not both
• Range components are always going to be positive
• Always asume that the starting component is going to be prior to the second one (if you feel brave enough you can skip this rule)

If you feel like this katas are too easy for you try implementing a solution differently, maybe use some functional programing or do it with OOP. Furthermore, code quality is valued a lot so try to run your solution as clean as possible following good practices.

Usage

# Clone the repo
git clone https://github.com/MonkeyAndres/crazy-ranges-kata.git

# Install dependencies
npm install

# Run tests
npm test

Expanding ranges

Write a function that could transform a range definition into a list of all the items inside the range.

Requirements:

• For numeric ranges like 1-3 we should generate [1, 2, 3]
• For mixed ranges like A1-A3 we should generate [A1, A2, A3]
• For mixed ranges like A1-B3 we should generate [A1, A2, A3, B1, B2, B3]

You can see more examples in the written test for this ranges. Feel free to edit and add your own tests and special cases to ensure that the function is well tested.

Contract existing ranges

Write a function that could group some range items into a range when needed.

Requirements:

• For numeric items like [1, 2, 3] we should group them as [1-3]
• For mixed ranges like [A1, A2, A3] we should group [A1-A3]
• For mixed ranges like [A1, A2, A3, B1, B2, B3] we should group [A1-A3, B1-B3]
• The groupRangeItems function should ALWAYS return an array

You can see more examples in the written test. Feel free to edit and add your own tests and special cases to ensure that the function is well tested.