1for (const student of students) {
2  console.log(student);
3}

1for (const student of students) {
2  console.log(student);
3}

1class Item {}

1class Item {}

1// This class' sole purpose is to encapsulate iteration for the Aggregate/Collection
2class CollectionIterator implements Iterator<Item> {
3  // The collection of items over which you want to iterate
4  collection: Array<Item> = [];
5
6  constructor(collection: Array<Item>) {
7    this.collection = collection;
8  }
9
10  next(value?: any): IteratorResult<Item> {
11    // Return the next value and done (is iteration completed or not)
12    return {
13      done: false,
14      value: new Item(),
15    };
16  }
17}

1// This class' sole purpose is to encapsulate iteration for the Aggregate/Collection
2class CollectionIterator implements Iterator<Item> {
3  // The collection of items over which you want to iterate
4  collection: Array<Item> = [];
5
6  constructor(collection: Array<Item>) {
7    this.collection = collection;
8  }
9
10  next(value?: any): IteratorResult<Item> {
11    // Return the next value and done (is iteration completed or not)
12    return {
13      done: false,
14      value: new Item(),
15    };
16  }
17}

1// A class that holds collection to a bunch of similar items, and other related things
2class Collection implements Iterable<Item> {
3		collection: Array<Item> = []
4
5		// Override this method to implement Iterable interface
6		// Return the AggregateIterator class object
7    [Symbol.iterator](): Iterator<Item> {
8        return new CollectionIterator(this.collection)
9    }
10}

1// A class that holds collection to a bunch of similar items, and other related things
2class Collection implements Iterable<Item> {
3		collection: Array<Item> = []
4
5		// Override this method to implement Iterable interface
6		// Return the AggregateIterator class object
7    [Symbol.iterator](): Iterator<Item> {
8        return new CollectionIterator(this.collection)
9    }
10}

1class Item {}

1class Item {}

1class Collection { // No need to explicitly implement any build-in interface
2
3    collection: Array<Item> = []
4
5		// No need to explicitly have IterableIterator<Item> as return type
6    [Symbol.iterator]() {
7        return this;
8    }
9
10		// No need to explicitly have IteratorResult<Item> as return type
11    next() {
12        return {
13					done: false,
14					value: new Item()
15				}
16    }
17}

1class Collection { // No need to explicitly implement any build-in interface
2
3    collection: Array<Item> = []
4
5		// No need to explicitly have IterableIterator<Item> as return type
6    [Symbol.iterator]() {
7        return this;
8    }
9
10		// No need to explicitly have IteratorResult<Item> as return type
11    next() {
12        return {
13					done: false,
14					value: new Item()
15				}
16    }
17}