Solution for the frontend assignment.
In this project, you will be creating a drag and drop system that allows users to place markers on a coordinate grid. Markers should snap to the closest X and Y cordinate.
Create a webpage that has a main content area with a left sidebar. In the sidebar, create a list of 4 markers. Each marker displays the X and Y coordinate they should be placed on. In the main content area, use the D3 library to create a 10x10 grid. Below the grid, create a "check" button that is disabled until all items are dragged onto the grid. After the user clicks the "check" button, display correct or incorrect on the screen.
The additional packages used are redux-actions which simplifies the process of creating new actions using
FLUX Standard Action, react-dnd to implement drag'n'drop functionality. Although D3 was used for the grid I would prefer to implement it with plain React to avoid side effects. 
React, Redux, Webpack, KOA, Babel, ESLint
// Install local dependencies
npm install// Start dev server
npm start
// Start dev server with nodemon
npm run dev
// Run tests
npm run test
// Run linter
npm run lint