What are some examples of iterable objects in TypeScript?

Can you give me some examples of iterable objects in TypeScript?

Sure! In TypeScript, iterable objects include arrays, strings, maps, and sets. For example, you can iterate over an array using a for...of loop.

How do I create a custom iterable object?

To create a custom iterable object, you need to implement the Symbol.iterator method. This method should return an iterator object that defines a next method.

Can you show me a code example of a custom iterable?

Absolutely! Here's a simple example:

class MyIterable {
    private items: number[];

    constructor(items: number[]) {
        this.items = items;
    }

    [Symbol.iterator]() {
        let index = 0;
        const items = this.items;
        return {
            next(): IteratorResult<number> {
                if (index < items.length) {
                    return { value: items[index++], done: false };
                } else {
                    return { value: undefined, done: true };
                }
            }
        };
    }
}

const iterable = new MyIterable([1, 2, 3]);
for (const item of iterable) {
    console.log(item);
}

This will log 1, 2, and 3.

What are the benefits of using iterable objects?

Using iterable objects allows for cleaner and more readable code, especially when working with loops. They also enable the use of built-in methods like map, filter, and reduce.