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Arrow function expressions JavaScript MDN

One important solution to XSS vulnerabilities is HTML sanitization. In JavaScript, objects can be instantiated directly from a function. All major web browsers have a built-in JavaScript engine that executes the code on the user’s device. JavaScript is the dominant client-side scripting language of the Web, with 99% of all websites using it for this purpose.[10] Scripts are embedded in or included from HTML documents and interact with the DOM.


To learn more about asynchronous programming, you can read about using promises or follow the asynchronous JavaScript tutorial. In fact, the single-threaded model has made Node.js a popular choice for server-side programming due to its non-blocking IO, making handling a large number of database or file-system requests very performant. However, CPU-bound (computationally intensive) tasks that are pure JavaScript will still block the main thread. JavaScript offers the class syntax that’s very similar to languages like Java.

Why learn JavaScript?

JavaScript is primarily used for enhancing web pages by adding interactivity, dynamic content, and user-friendly features. It runs directly in web browsers and allows developers to create responsive and engaging user interfaces. Objects in JavaScript are complex data types that allow for the creation of structured entities with properties and methods.

  • Throughout this page, we’ve constantly mentioned that certain features are language-level while others are runtime-level.
  • Some browsers include partial protection against reflected XSS attacks, in which the attacker provides a URL including malicious script.
  • Functions aren’t special data structures in JavaScript — they are just a special type of object that can be called.
  • They offer built-in functions and methods that enhance web pages, making them more dynamic and interactive.
  • A much more detailed guide to the JavaScript language, aimed at those with previous programming experience either in JavaScript or another language.
  • However, CPU-bound (computationally intensive) tasks that are pure JavaScript will still block the main thread.

python for javascript developers is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles. JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard.[11] It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM).

JS Tutorial

These scripting languages offer programming tools to a much wider audience because of their easier syntax, specialized built-in functionality, and minimal requirements for object creation. It is easy to learn, lightweight, cross-platform, single-threaded, and interpreted compiled language. It is widely used for web development, both on the client side and server side.

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