Road to Senior: Where Your Data Lives

Short summary

Understand JavaScript's Stack vs Heap memory model: primitives live on the Stack (fast, small, auto-cleanup) while objects live on the Heap (large, flexible). Value types copy their actual value; reference types copy only the memory address, explaining why `[] === []` is false. `const` locks the reference itself, while `Object.freeze()` locks the actual object data.

• •Stack stores primitives (fast, small, automatic cleanup); Heap stores objects (large, flexible)
• •Value types copy values; reference types copy only the memory address
• •const prevents reference reassignment; Object.freeze() prevents object mutation

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