kopasetik / semaphore

Documentation for this code challenge

‘Getting Started’

• Javascript versions - (Server) Node.js version 14+; (Client) Javascript for Chrome 94+
• Package manager - Yarn

Install by

• going to the server folder and running yarn
• then going to the client folder and running yarn

Initialize by

• going to the server folder and running node index.js
• then going to the client folder and running yarn east, yarn west, yarn south, yarn north (each in a separate tab)
• visit the lights at the following addresses as separate tabs in your browser:

• east: localhost:1234
• south: localhost:4321
• west: localhost:4000
• north: localhost:1155

• Once those tabs are open, open a devtools console window for each one. Watch as the logs change according to time. Each light change will display as a text message in the console.

‘Code Organization’

• I put the traffic light controller into the server folder
• I put the lights into the client folder
• Within the client folder there's a file for each light that's named according to direction (south.html, west.html, etc.) North is in index.html

‘Test Suite’

• Run tests by

• going to the server folder and running yarn test

'Unknowns/Assumptions'
That you would appreciate seeing this code even if it does not have:

• full test coverage
• the British use case

'What I learned during this exercise'

• Socket.io
• Recursive setTimeout to use non-uniform time intervals