JavaScript tutorials

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What is JavaScript?

JavaScript is a coding language used to make online pages interactive. It is object oriented and cross-platform. JavaScript allows you to have clickable buttons, complex animations, popup menus, etc. You can also get more advanced versions of javascript on the server side that allows you to add in more functionality to any website; more than just downloading files. Javascript is able to connect to the objects of its environment when inside a host environment, providing a programmatic control over them.

It has a standard library of objects as well as a core set of language elements such as control structures, operators, and statements. The core javascript is able to be extended for a range of purposes by supplementing it with other, additional objects, e.g.

On the client side, javascript will extend the core language by giving objects for controlling purposes over a browser and its Document Object Model. E.g. client side extensions authorize an app to put elements on an HTML form, as well as authorize them to respond to user events like form input, mouse clicks, and page navigation.

On the server side, javascript can extend the core language by supplying things related to running javascript on a server. E.g. server side extensions provide continuity of info from one invocation to another, make it possible for applications to communicate with a database, or perform file manipulations on a server. This signifies that in the browser, Javascript is able to modify the appearance of the webpage. Similarly, Node.js Javascript on the server is able to respond to custom requests given by code that is written in the browser.

JavaScript and Java

Java and Javascript resemble each other in some respects but are very different in others. The Javascript language is similar to Java, however it doesn’t have the strong type checking and static typing that Java does. Javascript generally follows the majority of Java expression syntax, basic control-flow constructs, and naming conventions, which was the reason why its name was changed from LiveScript to JavaScript.

In comparison to Java’s compile-time system of classes that are built by declarations, Javascript supports a runtime system that is based upon a tiny number of data types that represent Boolean, numeric, and string values. As opposed to the more common class-based object model, Javascript has a prototype-based object model. This prototype-based model is able to provide dynamic inheritance, so, what is inherited is subject to vary for each object. As well as this, Javascript supports functions that don’t have any special declarative requirements. Executing as loosely typed methods, functions can be properties of objects. JavaScript is a very free-form language compared to Java. You do not have to declare 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. Variables, parameters, and function return types are not explicitly typed.

Javascript is much more free-form than Java. It’s not necessary to declare all classes, variables, and methods. You don’t need to concern yourself with whether or not methods are private, public, or protected. Implementing interfaces is not necessary.

Java is designed for type safety and fast execution; it is a class-based programming language. Type safety signifies that you’re unable to access a private memory or cast an integer into an object by corruption of Java bytecodes. Programs exclusively consist of classes and their methods due to Java’s class-based model. Java’s strong typing and class inheritance usually need tightly coupled object hierarchies. Due to these requirements, Java programming is more complicated 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.

In comparison, Javascript has descended from a smaller, more dynamically typed line of languages such as dBase and HyperTalk. It is because of their lack of requirements for object creation, specialized built-in functionality, and easier syntax that these scripting languages offer tools for programming to a much broader audience.

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