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See How JavaScript Arrays Work in Memory

Arrays in JavaScript are more complex than they appear. How does push() grow the array? What happens during splice()?

This visualizer reveals:

• Contiguous memory layout and V8's element kinds
• How push, pop, shift, and unshift modify the array
• How map, filter, and reduce create new arrays
• The real cost of array operations in time complexity

▶ Open Interactive Visualizer