https://github.com/jferrl/string-calculator-kata
https://github.com/jferrl/string-calculator-kata
Last synced: about 2 months ago
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- Host: GitHub
- URL: https://github.com/jferrl/string-calculator-kata
- Owner: jferrl
- Created: 2020-11-30T14:38:10.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-12-03T15:23:43.000Z (over 5 years ago)
- Last Synced: 2025-12-26T08:34:41.775Z (6 months ago)
- Language: JavaScript
- Size: 321 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# String Calculator Kata
## Incremental kata
https://kata-log.rocks/string-calculator-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.
- Try not to read ahead.
- Do one task at a time. The trick is to learn to work incrementally.
- Make sure you only test for correct inputs. there is no need to test for invalid inputs for
this kata
- Test First!
### Learn TDD
### TDD in terms of States and Moves
http://coding-is-like-cooking.info/2011/05/tdd-in-terms-of-states-and-moves/
## Commands
All the different build steps are orchestrated via [npm scripts](https://docs.npmjs.com/misc/scripts).
| Npm Script | Description |
| ------------ | ------------------------------------------------------------------- |
| `start` | Runs node on `dist/index.js` which is the apps entry point |
| `build` | Full build. Runs ALL build tasks (`build-ts`) |
| `test` | Runs tests using Jest test runner |
| `watch-test` | Runs tests in watch mode |
| `build-ts` | Compiles all source `.ts` files to `.js` files in the `dist` folder |
## 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.