What is the difference between an iterable and an iterator? Can something be both?

Q: What is the difference between an iterable and an iterator? Can something be both?

An iterable is any object that implements the `[Symbol.iterator]()` method, which returns an iterator. Examples include `Array`, `String`, `Map`, and `Set`. An iterator is an object with a `next()` method that produces values. An object can be both iterable and iterator if it has `[Symbol.iterator]()` returning `this` and also a `next()` method, allowing it to be consumed by `for...of` while managing its own iteration state.

Difficulty: 5/10

iterable protocol, iterator protocol, for...of loop

An iterable is an object that can be iterated over (it has a `Symbol.iterator` method). An iterator is an object that performs the iteration (it has a `next` method). An object can be both if it implements both methods.

An iterable is any object that implements the [Symbol.iterator]() method, which returns an iterator. Examples include Array, String, Map, and Set. An iterator is an object with a next() method that produces values. An object can be both iterable and iterator if it has [Symbol.iterator]() returning this and also a next() method, allowing it to be consumed by while managing its own iteration state.

Scenario Questions

0-2 years experience

Follow-up Questions

Difficulty: 5/10

iterable protocol, iterator protocol, for...of loop

An iterable is an object that can be iterated over (it has a `Symbol.iterator` method). An iterator is an object that performs the iteration (it has a `next` method). An object can be both if it implements both methods.

Scenario Questions

0-2 years experience

What is the difference between an iterable and an iterator? Can something be both?

An iterable is an object that can be iterated over (it has a Symbol.iterator method). An iterator is an object that performs the iteration (it has a next method). An object can be both if it implements both methods.

Scenario Questions

Follow-up Questions

What is the difference between an iterable and an iterator? Can something be both?

An iterable is an object that can be iterated over (it has a Symbol.iterator method). An iterator is an object that performs the iteration (it has a next method). An object can be both if it implements both methods.

Scenario Questions

Follow-up Questions

An iterable is an object that can be iterated over (it has a `Symbol.iterator` method). An iterator is an object that performs the iteration (it has a `next` method). An object can be both if it implements both methods.

An iterable is an object that can be iterated over (it has a `Symbol.iterator` method). An iterator is an object that performs the iteration (it has a `next` method). An object can be both if it implements both methods.