What is JavaScript and Difference between the JavaScript and Java

What is JavaScript and the Difference between JavaScript and Java? If You Find The Answer Of This Question Then This Article Is Definitely For You. In This Article, We Will Discuss What Is JavaScript and Java, What can JavaScript do? Advantages of JavaScript. So Without Wasting Time Let’s Know About The JavaScript and Java.

What is JavaScript

JavaScript is the most popular scripting language on the Internet and works in all major browsers such as Internet Explorer, Firefox, Chrome, Opera, and Safari.

  • JavaScript was designed to add interactivity to HTML pages.
  • JavaScript is a scripting language
  • A scripting language is a lightweight programming language.
  • JavaScript is usually embedded directly into HTML pages.
  • Javascript is an interpreted language
  • everyone can use JavaScript without purchasing a license

JavaScript’s official name is ECMAScript.  ECMAScript is developed and maintained by the ECMA organization.

 ECMA – 262 is the official JavaScript standard. The language was invented by Brendan Eich at Netscape (with Navigator 2.0), and has appeared in all Netscape and Microsoft browsers since 1996.

The development of ECMA – 262 started in 1996, and the first edition was adopted by the ECMA General Assembly in June 1997. The standard was approved as an international ISO (ISO / IEC 16262) standard in 1998.

The development of the standard is still in progress, The HTML <script> tag is used to insert a java script into a HTML page.

What can JavaScript do?

JavaScript gives HTML designers a programming tool – HTML authors are normally no programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small “snippets” of code into their HTML pages.

JavaScript  can put dynamic text into an HTML page – A JavaScript statement like this: document.write (“<h1>” + name + “</h1>”) can write a variable text into an HTML page.

JavaScript can react to events  – A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element.

JavaScript can read and write HTML elements – A JavaScript can read and change the content of an HTML element.

JavaScript can be used to validate form data before it is submitted to a server.  This saves the server from extra processing. JavaScript can be used to detect the visitor’s browser, and – depending on the browser – load another page specially designed for that browser.

JavaScript can be used to store and retrieve information on the visitor’s computer.  

Advantages of JavaScript

(a) Speed: Being client-side, JavaScript is very fast because any code functions can be run immediately instead of having to contact the server and wait for an answer.

(b) Simplicity: JavaScript is relatively simple to learn and implement.

(c) Versatility: JavaScript plays nicely with other languages ​​and can be used in a huge variety of applications.  Unlike PHP or SSI scripts, JavaScript can also be used inside scripts written in other languages ​​such as Perl and PHP. 

(d) Server Load: Being client – side reduces the demand on the website server.

(e) Easy to debug and testing.

(f) No special editor is required for it.

Disadvantages of JavaScript

(a) Security: Because the code executes on the user’s computer, in some cases it can be exploited for malicious purposes. This is one reason some people choose to disable  JavaScript.

 (B) Relying on End User: JavaScript is sometimes interpreted differently by different browsers. Whereas server-side scripts will always produce the same output, client-side scripts can be a little unpredictable. Don’t be overly concerned by this though –  as long as you test your script in all the major browsers you should be safe.

 JavaScript and Java

Java script and java are similar in some ways but fundamentally different in others .

  1. The JavaScript language resembles Java but does not have Java’s static typing and strong type checking.
  2. JavaScript supports most Java expression syntax and basic control – flow constructs.
  3.  In contrast to Java’s compile-time system of classes built by declarations, JavaScript supports a runtime based on a small number of data types representing numeric, boolean, and string values. ​​
  4. JavaScript has a simple, instance-based object model that still provides significant capabilities.
  5. JavaScript also supports functions without any special declarative requirements.  Functions can be properties of objects, executing as loosely typed methods.

Difference between the JavaScript and Java

What is JavaScript and Difference between the JavaScript and Java
What is JavaScript and Difference between the JavaScript and Java

JavaScript

  •  Interpreted (not compiled) by client.
  • Object – based.  Uses built – in, extensible objects, but no classes or inheritance. 
  • Code integrated with, and embedded in HTML.
  • Variables data types not declared (loose typing).
  •  Dynamic binding.  Object references checked at runtime. 

Java

  • Compiled bytecodes downloaded from Server, executed on the client.
  • Applets distinct from HTML (accessed from HTML pages).  
  • Variables data types must be declared (strong typing).
  • Static binding.  Object references must exist at compile time. 

Source: I&WT, Wikipedia
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Are Java and JavaScript the same?

NO!  
Java and JavaScript are two completely different languages ​​in both concept and design! is a powerful and much more complex programming language in the same category as C and C ++. it developed by Sun Microsystems.

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