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README.md

STRING CALCULATOR

Rules

  1. Strictly practice TDD: Red, Green, Refactor
  2. No use of the debugger or any console writes are allowed. 2.1. Make use of a learning test to focus on the troublesome code.

The Kata

  1. Create a simple String calculator with the signature: function add(input: string): number
    • 1.1. The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example “” or “1” or “1,2”
    • 1.2. Start with the simplest test case of an empty string, then move to one and two numbers
  2. Allow the add() function to handle an unknown amount of numbers
  3. Allow the add() function to handle new lines between numbers (in addition to commas).
    • 3.1. the following input is ok: “1\n2,3” (will equal 6)
    • 3.2. the following input DOES NOT need to be handled: “1,\n” (not need to prove it - just clarifying)
  4. Support different delimiters
  • 4.1. To change a delimiter, the beginning of the string will contain a separate line specifying the custom delimiter. This input looks like this: “//{delimiter}\n{numbers…}” (Note that the curly braces are representing the sections of the input and are not input formatting).
  • 4.2. For example: “//;\n1;2” should return a result of 3 because the delimiter is now ‘;’.
  • 4.3. The first line is optional (all existing scenarios should still be supported).
  • 4.4. Do not worry about supporting the specification of ‘\n’ as an explicit custom delimiter. New lines should always be supported as delimiters in your number string.
  1. Calling add() with a negative number in the input will throw an exception “negatives not allowed” - and the negative that was passed, if there are multiple negatives, show all of them in the exception message
  2. Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2

Bonus

  1. Delimiters can be of any length with the following format: “//[{delimiter}]\n{numbers…}”
  • 1.1. For example: “//[]\n12***3” should return 6.
  • 1.2. Note that the square brackets are required around the multiple character delimiter.
  • 1.3. A square bracket is not a valid delimiter.
  • 1.4 Allow multiple delimiters like this: “//[{delim1}][{delim2}]\n{numbers…}”
    • 2.1. For example “//[][%]\n12%3” should return 6.
    • 2.2. Note that once again the square brackets are required around each custom delimiter.
  1. Make sure you can also handle multiple delimiters with length longer than one char