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Come Thou Fount

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See the Pen CSS Blossoming Flowers at Magical Night by Md Usman Ansari (@mdusmanansari) on CodePen.

Mozilla Web Docs: Introduction to JavaScript

This chapter introduces JavaScript and discusses some of its fundamental concepts.

What you should already know

This guide assumes you have the following basic background:

• A general understanding of the Internet and the World Wide Web (WWW).
• A good working knowledge of HyperText Markup Language (HTML).
• Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.

What is JavaScript?

JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive (e.g., having complex animations, clickable buttons, popup menus, etc.). There are also more advanced server side versions of JavaScript such as Node.js, which allow you to add more functionality to a website than downloading files (such as realtime collaboration between multiple computers). Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programatic control over them.

JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:

• Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, the client-side extensions allow an applicatiopn toplace elements on an HTML form and respond to user evenst such as mouse clicks, form imput, and page navigation.
• Server-side JavaScript extends the core language by supplying objets relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to the another of the application, or perform file manipulations on a server.

This means that in the browser, JavaScript can change the way the webpage (DOM) looks. And, likewise, Node.js JavaScript on the server can respond to custom requests sent by code executed in the browser.

JavaScript and Java

JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions, and basic control-flow constructs which was the reason it was renamed from LiveScript to JavaScript.

In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numberic, Boolean, and string values. JavaScript has a prototype-based object model instead of the more common class-based object model. The prototype-based object model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements. Functions can be roperties of objects, executing as loosely typed methods.

JavaScript is a very free-form language compared to Java. You do not have to delcare all variables, classes, and methods. You do not have to be concerned with whether methods are public, private, or protected, and you do not have to implement interfaces. Veriables, parameters, and function return types are not explicitly typed.

Java is a class-based programming language desiged for fast execution and type safety. Type safety means, for instance, that you can't cast a Java integer into an object reference or access private memory by corrupting the Java bytecode. Java's class-based model means that programs conbsist exclusively of classes and their methods. Java's class inherticance and strong typing generally require tightly coupled object hierarchies. These requirements make Java programming more complex than JavaScript programming.

In contrast, JavaScript descends in spirit from a line of smaller, dynamically typed languages such as HyperTalk and dBASE. 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.

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