Public React.js challenges shared by the EraCode community. These pages are teasers — skill maintenance starts when you attempt the full problem inside EraCode.
Quick performance-focused drill: identify when context updates cause unnecessary renders, then fix a small Provider so its value stays referentially stable across renders unless the data actually changes.
Quick check on ES module import shapes in a React codebase: identify correct import usage and patch a single broken import so the app renders.