https://github.com/akhansari/stringcalculatorkata

https://github.com/akhansari/stringcalculatorkata

fsharp kata pbt

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/akhansari/stringcalculatorkata
• Owner: akhansari
• Created: 2022-04-29T00:40:31.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2022-05-04T16:57:21.000Z (almost 3 years ago)
• Last Synced: 2024-11-08T19:51:37.929Z (3 months ago)
• Topics: fsharp, kata, pbt
• Language: F#
• Homepage:
• Size: 5.86 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# String Calculator Kata

Source: https://kata-log.rocks/string-calculator-kata

F# + Property based testing

## Incremental kata

It’s an incremental kata to simulate a real business situation: start of by reading the section 1 and completing it, then go onto section 2, and when you have finished that, look at section 3, etc.

### Step 1

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.

### Step 2

Allow the Add method to handle an unknown amount of numbers.

### Step 3

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)

### Step 4

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.

### Step 5

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.

### Step 6

Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2

### Step 7

Delimiters can be of any length with the following format: `"//[delimiter]\n"` for example: `"//[***]\n1***2***3"` should return 6.

### Step 8

Allow multiple delimiters like this: `"//[delim1][delim2]\n"` for example `"//[*][%]\n1*2%3"` should return 6.

### Step 9

Make sure you can also handle multiple delimiters with length longer than one char.