CodeSignal Probability Lab

A Bespoke Simulation for repeated-trial probability experiments (coin, die, spinner) that visualizes convergence: as you run more trials, relative frequencies become more stable and tend to approach theoretical probabilities.

What’s Included

• One event mode: event builder (select outcomes), live bar chart, convergence chart, frequency table
• Two events mode: joint heatmap + two-way table; click a cell to see joint and conditional probabilities
• Bias controls: explore fair vs biased devices
• Seeded randomness: optionally reproduce runs with a seed

Development

npm run start:dev

Open http://localhost:3000.

Build / Production

npm run build
npm run start:prod

Key Files

• client/index.html – app shell + layout
• client/codesignal-probability-lab.js – simulation engine + rendering
• client/codesignal-probability-lab.css – app-specific styling
• client/help-content.html – Help modal content