JavaScript Closures: How They Actually Work

Short summary

Deep explanation of how JavaScript closures work through memory management and garbage collection. Shows how inner functions retain access to outer variables via the hidden [[Scope]] pointer, with a step-by-step walkthrough of compilation, execution, and scope chain traversal.

• •Closures persist outer function scope in memory because the inner function's [[Scope]] property creates a reachable bridge to parent execution contexts
• •JavaScript engine compiles before execution, registering all variables and functions; garbage collector skips cleanup when references remain
• •Multiple closure instances maintain separate isolated memory contexts, each with independent variable copies

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