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See How JavaScript Closures Work

Closures are one of the most powerful — and misunderstood — concepts in JavaScript. This visualizer makes them obvious.

Watch in real time as:

• Inner functions capture variables from outer scopes
• Scope chains are built and traversed
• Captured variables persist after the outer function returns
• V8 creates closure contexts to keep variables alive

If you've ever been confused by closures in a job interview, spend 2 minutes stepping through the examples here.

▶ Open Interactive Visualizer