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Introduction to Java Script – tririd.com

An Introduction to JavaScript

What is JavaScript?

JavaScript was initially created to “make web pages alive”.

The programs in this language are called scripts. They can be written right in the HTML and execute automatically as the page loads.

Scripts are provided and executed as a plain text. They don’t need a special preparation or a compilation to run.

In this aspect, JavaScript is very different from another language called Java.

Why JavaScript?

At present, JavaScript can execute not only in the browser, but also on the server, or actually on any device where there exists a special program called the JavaScript engine.

The browser has an embedded engine; sometimes it’s also called a “JavaScript virtual machine”.

Different engines have different “codenames”, for example:

  • V8– in Chrome and Opera.
  • Gecko– in Firefox.
  • The modern JavaScript is a “safe” programming language. It does not provide low-level access to memory or CPU, because it was initially created for browsers which do not require it.
  • In-browser JavaScript can do everything related to webpage manipulation, interaction with the user and the webserver.

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