JS Rulez

A simple rule processor written in Javascript using React as view layer.

Challenge description

The challenge is to create a simple flow engine.

A flow engine is an application that executes a flow consisting of several linked rules, in this case against some incoming data (a JSON string that can be parsed to a JavaScript object literal).

Each rule should contain (at least)

• An ID (unique within the flow, required)
• A rule that will be run against the incoming JSON data. This is a function that takes a parameter and returns a boolean result. Each function should be called with the same incoming data (the JS object literal)
• An ID of the rule to execute if the function returns true (true_id)
• An ID of the rule to execute if the function returns false (false_id)

Pass an object (an example of an object and a rule is given below) to the created flow.

The execution will end when a null is provided for the true_id (and the function returns true) or when null is provided for the false_id (and the function returns false).

Additionally, the flow engine (with the provided rule-set) should not be circular.

Mockup

Please implement UI according to the following design:

Instructions

• Please use ReactJs as view layer. For the Flow logic use a pure JavaScript (no underscore and other libraries)
• Unit tests and bundler/task runner are a plus.
• Use pure CSS preprocessor for the styling of the UI - no external libraries

What we're looking for:

• Code quality
• Correctness
• Technical choices

We appreciate your time and energy completing the coding exercise and will review your solution as quickly as possible.

Install

Run yarn install (it should also work with NPM).

Build

Run yarn run build.

You can try it out locally by running yarn run start on your browser or codebikeandmore.com/jsrulez

Test

Run yarn test and everything should be 💚