joshcampbell191 / stringcalculatorkata

String Calculator Kata

Credit

This exercise is based off the work of Roy Osherove

Before you start

• Do not read ahead
• Do one task at a time
• Refactor as necessary
• Do not handle invalid inputs
• Check in often
• Tests are your friends

Getting Started

Clone the branch from here

Create and push a branch under attempts/ now. Ideally you can call it <first name>_<last name> (eg. attempts/philippe_castonguay)

You will be building a String Calculator. The initial branch contains the following projects:

• Product - The String Calculator you will be developing, with the initial function stub
• Product.Tests - An XUnit test file with one failing test
• Product.CLI - A simple console application that will run the calculator and show the results

Only expand the details once you have completed the previous step, to avoid looking ahead

0. Base case

Start with the base case.

Eg. 
"" → 0

1. Loneliest

When one number is passed, return that number for the sum

Eg. 
"1" → 1
"10" → 10

2. Basics

When two numbers are passed, separated by a plus '+', return their sum

Eg.
"1+1" → 2
"12+34" → 36

3. N

Allow any number of numbers to be passed, and add ',' as a delimiter

Eg.
"1,2,3" → 6
"1,1,1,1,1" → 5

4. NL

Allow the new line character (\n) to be used as a delimiter as well

Eg.
"1\n2" → 3

5. Custom

Allow optional custom delimiters, in the format of "//{delimiter}{numbers}" (It should continue to work without the delimiters)

Eg.
"//;1;2" → 3

6. Negative

When a negative is passed, throw an Exception with the message "Negatives not allowed ({number})", where number is the first negative number that was encountered

Eg.
"-1" → "Negatives not allowed (-1)"

7. Numerous

When multiple negatives are passed, return the comma-separated list of all the negatives in the order they were presented, instead of just the first one

Eg.
"-1,-2" → "Negatives not allowed (-1,-2)"

8. Mille

Ignore numbers greater than 1000

Eg.
"1,1005" → 1

9. Delimited

Allow for delimiters of any length, using the format "//[{delimiter}]{numbers}". (The previous delimiter method should continue to work)

Eg.
"//[***]1***2***3" → 6

10. Unlimiated

Allow for multiple long delimiters, using the format "//[{delimiter1}][{delimiter2}][{...}]{numbers}".

Eg.
"//[*][%]1*2%3" → 6

11. Revision

Ensure that you can use multiple and long delimiters

Eg.
"//[***][%%%]1***2%%%3" → 6

12. Conclusion

Woohoo! You're done! Check it in and reflect.