Can you explain TypeScript iterators with examples?

Can you explain TypeScript iterators with examples?

Sure! In TypeScript, iterators are objects that allow you to traverse through a collection, like arrays or strings. They implement the Iterator interface, which has a next() method that returns an object with value and done properties.

Can you show me a simple example of an iterator?

Absolutely! Here's a simple example:

class MyIterator {
    private index = 0;
    private data = ['a', 'b', 'c'];

    next() {
        if (this.index < this.data.length) {
            return { value: this.data[this.index++], done: false };
        } else {
            return { value: undefined, done: true };
        }
    }
}

const iterator = new MyIterator();
console.log(iterator.next()); // { value: 'a', done: false }
console.log(iterator.next()); // { value: 'b', done: false }
console.log(iterator.next()); // { value: 'c', done: false }
console.log(iterator.next()); // { value: undefined, done: true }

What about using built-in iterators in TypeScript?

Great question! TypeScript supports built-in iterators like those found in arrays. For example, you can use the for...of loop to iterate over an array:

const arr = [1, 2, 3];
for (const value of arr) {
    console.log(value);
}
// Output: 1, 2, 3