Loops

Summary

`for`, `for...of`, `for...in`, `while` and `do...while` — different ways to repeat code, each suited to different iteration needs (arrays, objects, custom conditions). Iteration is a foundation for data processing, but choosing the right loop or array method improves clarity and reduces accidental mutation or indexing errors.

• 1Use `for...of` to iterate an array and `for...in` to iterate object keys. Verify the behavior with realistic data and handle the failure or empty state as well.
• 2Learn why `for...of` is usually preferred over classic `for` loops for arrays. Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Practice `break` and `continue` to control loop flow.