simple_calculator

A simple calculator using HTML, CSS and JavaScript. The basic idea of this project is to implement a javascript application following the ground rules:

• modular code
• separation of concern
• loosely coupled
• encapsulate
• testable

Publish–subscribe pattern is used to make the application loosely coupled. AMD pattern is followed using dojo for scalable application. Unit and functional tests are written using Intern.

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Requirements

• Node package manager
• Please refer to the package.json file for dependencies.

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How to run

• Clone the project
• Run npm install from the simple_calculator directory to download and install the dependencies.
• Open simple_calculator/src/index.html in a browser window
• Optional
  • run npm start to run the node server
  • look at the console message for the host address

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How to test

• Run npm test from the simple_calculator directory to run the test cases.
• Apart from the console output, the code coverage results will be stored in simple_calculator/tests/reports.
• After running the tests, open simple_calculator/tests/reports/index.html in a browser window to look at the results.

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Courtesy and useful links

• Styled following the instructions at http://thecodeplayer.com/walkthrough/javascript-css3-calculator.
• Basic publish-subscribe pattern in javascript at https://gist.github.com/learncodeacademy/777349747d8382bfb722.
• Modular javascript tutorial series https://www.youtube.com/playlist?list=PLoYCgNOIyGABs-wDaaxChu82q_xQgUb4f.
• Publish-subscribe pattern basics http://learning-0mq-with-pyzmq.readthedocs.io/en/latest/pyzmq/patterns/pubsub.html.
• Intern JavaScript test plugin https://theintern.github.io/.
• jQuery (write less, do more) https://jquery.com/.
• AMD
• Why Choose Dojo?
• How to Unit Test Private Functions in JavaScript by Philip Walton https://philipwalton.com/articles/how-to-unit-test-private-functions-in-javascript/. Many other important topics are covered in his blog https://philipwalton.com/.
• Some books:
  • Learning Javascript Design Script Patterns by Addy Osmani.
  • Pro JavaScript Design Patterns by Dustin Diaz and Ross Harmes.
• Dealing with numbers in javascript:
  • What Every Computer Scientist Should Know About Floating-Point Arithmetic
  • Why don’t my numbers add up?
  • JavaScript Numbers