Best of Modern JavaScript — Iterators and Generators

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at JavaScript iterable objects and generator functions.

Clean Up of Generators

If we use break to break a loop, then we can clean up with the try-finally constructor.

For example, if we have:

function* genFn() {
  yield 'foo';
  yield 'bar';
  yield 'baz';
  console.log('clean up');
}
const gen = genFn();
for (const x of gen) {
  console.log(x);
}

Then the console log will run when the generator returned all the items.

However, if we use break in our loop:

for (const x of gen) {
  console.log(x);
  break;
}

Then the console log is never run.

#javascript

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Javascript ES6 Iterators: Complete Guide on Iterables and Iterators

Javascript iterators is a new concept of ES6 in which it processes each of the items in the collection, which is a pervasive operation. Iterators are a new way to _loop _over any collection in JavaScript.

They were introduced in ES6 and have become popular since they are widely JavaScript provides several ways of iterating over the collection, from simple for loops to map() and filter() Iterators and  Generators bring the concept of iteration directly into the core language and provide a mechanism for customizing the behavior of loops.

Iterators in Javascript

An iterator is a new concept of ES6. An Iterator is an object that lets us iterate through an Array, an Object, a String, or even custom Objects.

The Iterator allows us to effectively loop over a collection of objects like an array, string, objects, or other data structures.

The most common Iterator in Javascript is the Array iterator, which returns each value in the associated array in sequence.

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