Best of Modern JavaScript — Handler Methods

Since 2015, JavaScript has improved immensely.

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

In this article, we’ll look at how to control JavaScript object operations.

Make Objects Non-Configurable

We can make objects non-configurable.

This means that we can’t change the property descriptor of an object.

The property descriptors include the property value, whether the property is writable, or whether it’s configurable.

Configurable means the ability to change the property descriptions of an object.

To disable configurability, we can write:

const obj = {};
Object.defineProperty(obj, 'foo', {
  value: 'bar',
  writable: false,
  configurable: false
});

We defined the obj.foo property with the Object.defineProperty method.

The 3rd argument has the property descriptors.

configurable set to false lets us disable changing property descriptors.

We also set writable to false so that we can’t change the value of the foo property’s value.

The enumerate Trap

ES6 proxies was originally going to include the enumerate trap to lets us change the behavior of the for-in loop.

But it’s removed to simplified proxies.

#javascript #technology #programming

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Best of Modern JavaScript — Handler Methods
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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.

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JavaScript Hello World Program

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

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</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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