What is the difference between `for…in` and `for…of` loops?

Question

JavaScript Developer — Hard

What is the difference between `for…in` and `for…of` loops?

Accepted Answer

The key difference between `for...in` and `for...of` loops is that `for...in` iterates over enumerable property keys, including inherited ones, while `for...of` iterates over values of iterables using the iterator protocol. This is why `for...in` should not be used on arrays for value iteration.