What are iterators in TypeScript and how do they work?

What are iterators in TypeScript and how do they work?

Iterators in TypeScript are objects that allow you to traverse through a collection, like arrays or maps, one element at a time.

Can you give me an example of how to create a custom iterator?

Sure! You can create a custom iterator by implementing the next() method in an object. Here's a simple example:

class Counter {
    private count = 0;
    next() {
        this.count++;
        return { value: this.count, done: false };
    }
}

const counter = new Counter();
console.log(counter.next()); // { value: 1, done: false }

What is the difference between an iterator and an iterable?

An iterable is an object that can be iterated over, like an array, while an iterator is the object that performs the iteration, providing the next() method.

How can I use the for...of loop with iterators?

You can use the for...of loop to iterate over any iterable object. It automatically calls the iterator's next() method for you.