Best of Modern JavaScript — Iterators and Iterables

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.

Iterators that are Iterable

We can move the next function into its own object method if we return this in the Symbol.iterator method.

For instance, we can write:

function iterate(...args) {
  let index = 0;
  const iterable = {
    [Symbol.iterator]() {
      return this;
    },
    next() {
      if (index < args.length) {
        return {
          value: args[index++]
        };
      } else {
        return {
          done: true
        };
      }
    },
  };
  return iterable;
}

We have the next within the iterable object we return.

The args have the items that we want to iterate over.

We return the object with the value while the index is less than args.length .

And we return an object with done set to true if there’s nothing left to iterate.

We return this inside the Symbo.iterator method so that the iteration can be done.

for-of loops work only with iterables and not the iterators directly.

Iterables always have the Symbol.iterator method, so we got to put our iterator over our iterable object to make it iterable.

return() and throw()

There’re 2 iterator methods that are optional.

return gives us an iterator the opportunity to clean if iterator ends early.

throw lets us forward a method call to a generator that’s iterated via yield*

#javascript #programming #technology

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Best of Modern JavaScript — Iterators and Iterables
bindu singh

bindu singh

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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 arraystringobjects, 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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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

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