18th of 38 Questions.
What is the difference between a regular iterator and an async iterator? What protocol does an async iterator follow?
An async iterator returns Promises from next(), following the Async Iterator Protocol with Symbol.asyncIterator. Values are resolved asynchronously.
Regular iterators return { value, done } directly. Async iterators return a Promise that resolves to { value, done }, allowing iteration over asynchronous data sources (e.g., streams, paginated APIs). They are consumed with for await...of loops.