react-calculator

A simple calculator using React.

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View example on react-calculator-9002.surge.sh

How to run this project

$ cd react-calculator
$ npm install 
$ npm start 

How to test this project

$ cd react-calculator
$ npm test 

For the same quality gates used in CI:

npm run lint
npm run test:ci
npm run build

Architecture

App owns the calculator state and routes key presses into the pure operation engine. CalculatorKeyboard and CalculatorKey emit user input, while CalculatorScreen renders the current total. The operation engine accepts and returns a new { userTotal, calcVal, curVal, operand } state object; it does not mutate caller-owned state. Invalid arithmetic and division by zero produce an explicit Error display state instead of a browser alert.

The CI test command disables Jest's cache so every run exercises the checked out source. The production build is also compiled on every pull request.

Contributing

Contributions are welcome!

1. Fork it.
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

Or open up an issue.

Contributors

_{Gustavo Reyes}
💬 💻

Discussion and Collaboration

Use the GitHub Issues page for reproducible bugs and feature proposals. See CONTRIBUTING.md before opening a pull request and SECURITY.md for private vulnerability reports.

License

Licensed under the MIT License.