Credit Card Processing

This is a Node.js command line program which simulates credit card payments and validation.

Project was created for a potential employer.

Installation

$ cd credit-card-processing
$ npm install
$ npm link                      # Creates symlink to /usr/local/bin on OS X

Requirements:

• Node.js LTS (v4.0.0)
• npm v3.8.1

Usage

$ credit-card input.txt OR $ credit-card < input.txt

Testing

Tests are implemented using Mocha and assertions using Chai.

To run tests

npm test

Design Decisions

Language

For this project I chose Node.js as an opportunity to explore running command line style applications. Previously I've utilized Node.js for creating web servers and RESTful APIs using express.

I would have been equally comfortable using Python or Bash, however I saw the opportunity to learn about Node and the command line, as well as JavaScript testing.

Architecture

When calling credit-card input.txt the program executes in the following way:

[Executable] -> [Parser] -> [Command Execution] -> [Credit Card Object] -> [Output]

---

[bin/credit-card.js] -> [lib/parser.js] -> [lib/commands.js] -> [lib/CreditCard.js] -> [bin/credit-card.js]

--

To remove credit-card from /usr/local/bin (on Mac) run:

cd credit-card-processing
npm unlink