Incubyte-Assessment

TDD - String Calculator Kata

String Calculator TDD Kata

Create a simple String calculator with a method signature:

int Add(string numbers) The method can take up to two numbers, separated by commas, and will return their sum.

For example "" or "1" or "1,2" as inputs. (for an empty string it will return 0)

Hints:

Start with the simplest test case of an empty string and move to one and two numbers Remember to solve things as simply as possible so that you force yourself to write tests you did not think about Remember to refactor after each passing test 2. Allow the Add method to handle an unknown amount of numbers

Allow the Add method to handle new lines between numbers (instead of commas).

The following input is ok: "1\n2,3" (will equal 6) The following input is NOT ok: "1,\n" (not need to prove it - just clarifying) Support different delimiters

To change a delimiter, the beginning of the string will contain a separate line that looks like this: "//[delimiter]\n[numbers…]" for example "//;\n1;2" should return three where the default delimiter is ";" The first line is optional. all existing scenarios should still be supported
Calling Add with a negative number 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.

Allow the Add method to support different operands (+, -, *, /).

The Add method should now be enhanced to handle various arithmetic operands in addition to the default addition operation. This means that the method should be able to perform calculations using different arithmetic operations based on the specified operand.

Elaboration:
- Update the calculate method to accept an additional parameter called operand.
- Depending on the value of the operand parameter, adjust the calculation logic inside the calculate method to perform the corresponding arithmetic operation (addition, subtraction, multiplication, or division).
- Ensure that the method handles edge cases such as division by zero and throwing appropriate error messages.
- Update the tests to cover different operand scenarios. For example, test cases with addition (+), subtraction (-), multiplication (*), and division (/) operands.
Example:
- For input string "2,3,5" and operand *, the method should return the result of multiplying 2, 3, and 5, which is 30.
- For input string "8,4,2" and operand /, the method should return the result of dividing 8 by 4 and then dividing the result by 2, which is 1.
- If the operand is not one of the supported arithmetic operations, an appropriate error message should be thrown.
Usage:
```
const stringCalc = new StringCalculator();
const result = stringCalc.calculate("2,3,5", ",", "*"); // Returns 30
```

Installation/Usage:

npm install

npx mocha

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