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See How JavaScript Loops Iterate

Loops are where most beginners get confused. What does i++ actually do? When does the condition get checked?

This visualizer breaks down each phase:

• Init — variable declaration (let i = 0)
• Test — condition evaluation (i < 10)
• Body — the code inside the loop
• Update — the increment (i++)

Watch nested loops, while loops, and see exactly how iteration count affects time complexity.

▶ Open Interactive Visualizer