Deep Dive: Array Internals & Memory Layout

Array Internals & Memory Layout WHAT YOU'LL LEARN Arrays store elements in contiguous memory blocks — each element sits right next to the previous one Random access is O(1) because the address of arr[i] is just baseAddress + i * elementSize — a single arithmetic operation Insertion/deletion at arbitrary positions is O(n) because elements must be shifted to maintain contiguity JavaScript arrays are actually hash maps under the hood for sparse arrays, but V8 optimizes dense arrays to use contiguou