Javascript Introduction

  • Javascript Introduction

    Hello readers! If you want to learn complete javascript then you are on a right place. JavaScript Tutorial of studyrightnow is created and designed by our expert, for novice and professionals both.

    JavaScript was created in May 1995, by Brendan Eich at Netscape for their web browser, Netscape Navigator. Initially, JavaScript name was Mocha and later in the Netscape Navigator 2.0 beta, called LiveScript. And then it got its final name, JavaScript.

    Why learn JavaScript?

    According to studyrightnow, JavaScript is a tool used for front-end and back-end development, and it is highly used by full-stack developers. Companies like Walmart, Netflix, and PayPal are implementing JavaScript to implement their big internal applications. Having strong JavaScript knowledge will help you land your dream job.

    What is JavaScript?

    JavaScript is one of the most popular programming languages in the world of programmers which is used for client side implementations of dynamic pages for websites like validation, date time functions like alarm clock. But now a days javascript is growing faster than any other programming language and we can use javascript for client and server side implementations because of nodejs like real-time networking apps, command-line tools, and games, applications like single page applications, Geolocation APIs, net advertisements etc.

    You must need to love Javascript or if you hate it then it is very dangerous for you because in the age of Microservice and REST API, JavaScript is everywhere, on client side and server side. You can create mobile web app (hybrid app not native app) with javascript and html5 because of nodejs have made possible to run javascript on server side. Which has lot of advantages like save licensing cost $99 yearly to pay Apple for making IOS apps and you do not have to purchase MAC laptop to make your IOS app. 

    JavaScript is an object-based scripting language which is cross-platform (the capability of programming language i.e a software or hardware to run identically on different platforms) and lightweight (Syntax and features uses the least hardware and software resources, use very less memory to execute, Easily portable/Less size). The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browse. so it is called a translated language not a compiled language.

    Note: In the world of programming, there are many programmers (novice) who think that JavaScript and Java are the same. But for you kind information, JavaScript and Java are very much unrelated or different. Java is a very complex programming language which is statically typed whereas JavaScript is only a dynamically typed scripting language. The syntax of JavaScript is mostly influenced by the C programming language.

    How to Run JavaScript?

    As we studied before, JavaScript is the scripting language, the browser is responsible for running JavaScript code. It depends on the browser to execute JavaScript, when a user requests an HTML page containing JavaScript, sent to that browser. Do not worry about the browser, because all the modern web browsers such as Internet Explorer, Google Chrome, Firefox or any other browser, support JavaScript and this is the main advantage of JavaScript. Also, JavaScript runs on any operating system including Windows, Linux or Mac. Thus, JavaScript overcomes the main disadvantages of VBScript (Now deprecated) developed by Microsoft, which is limited to just Internet Explorer and Windows.

    Tools You Need For Practice
    To start with Javascript, you need a text editor of your choice including Notepad++, Visual Studio Code, Sublime Text, Atom or any other text editor to write your javascript code and a browser to display the web pages you develop.


    ECMAScript (ES) is a standard which provides scripting language like JavaScript, Jscript and ActionScript, specification controlled by ECMAScript International. If you want to learn more about ES6 then please click here. It is also called ECMAScrip 2015.

    ECMA Script6 (es6) implementation covers the following new features:

    1. Support for "const" and "let"
    2. Arrow Functions
    3. Template Literals
    4. Extended Parameter Handling
    5. Enhanced Object Properties
    6. Modules
    7. Classes
    8. Iterators
    9. Generators
    10. Collections
    11. New built in methods for various classes

    In principle, JavaScript and ECMAScript point the same thing. But you can understand the only difference below:

    The term JavaScript refers to the language and its implementations.
    The term ECMAScript refers to the language standard and language versions.


    Is Javascript Case Sensitive Programming Language:

    Yes! JavaScript is a case-sensitive language, means that the keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters. For example, Studyrightnow, studyRightnow, STUDYRIGHTNOW are three distinct variable or identifier names in javascript programming language.

    Look here we will explain it with the help of below example:

    Hello readers! If you want to learn complete javascript then you are on a right place. JavaScript Tutorial of studyrightnow is created and designed by our expert, for novice and professionals both.

    JavaScript was created in May 1995, by Brendan Eich at Netscape for their web browser, Netscape Navigator. Initially, JavaScript name was Mocha and later in the Netscape Navigator 2.0 beta, called LiveScript. And then it got its final name, JavaScript.

    Why learn JavaScript?

    According to studyrightnow, JavaScript is a tool used for front-end and back-end development, and it is highly used by full-stack developers. Companies like Walmart, Netflix, and PayPal are implementing JavaScript to implement their big internal applications. Having strong JavaScript knowledge will help you land your dream job.

    What is JavaScript?

    JavaScript is one of the most popular programming languages in the world of programmers which is used for client side implementations of dynamic pages for websites like validation, date time functions like alarm clock. But now a days javascript is growing faster than any other programming language and we can use javascript for client and server side implementations because of nodejs like real-time networking apps, command-line tools, and games, applications like single page applications, Geolocation APIs, net advertisements etc.

    You must need to love Javascript or if you hate it then it is very dangerous for you because in the age of Microservice and REST API, JavaScript is everywhere, on client side and server side. You can create mobile web app (hybrid app not native app) with javascript and html5 because of nodejs have made possible to run javascript on server side. Which has lot of advantages like save licensing cost $99 yearly to pay Apple for making IOS apps and you do not have to purchase MAC laptop to make your IOS app. 

    JavaScript is an object-based scripting language which is cross-platform (the capability of programming language i.e a software or hardware to run identically on different platforms) and lightweight (Syntax and features uses the least hardware and software resources, use very less memory to execute, Easily portable/Less size). The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browse. so it is called a translated language not a compiled language.

    Note: In the world of programming, there are many programmers (novice) who think that JavaScript and Java are the same. But for you kind information, JavaScript and Java are very much unrelated or different. Java is a very complex programming language which is statically typed whereas JavaScript is only a dynamically typed scripting language. The syntax of JavaScript is mostly influenced by the C programming language.

    How to Run JavaScript?

    As we studied before, JavaScript is the scripting language, the browser is responsible for running JavaScript code. It depends on the browser to execute JavaScript, when a user requests an HTML page containing JavaScript, sent to that browser. Do not worry about the browser, because all the modern web browsers such as Internet Explorer, Google Chrome, Firefox or any other browser, support JavaScript and this is the main advantage of JavaScript. Also, JavaScript runs on any operating system including Windows, Linux or Mac. Thus, JavaScript overcomes the main disadvantages of VBScript (Now deprecated) developed by Microsoft, which is limited to just Internet Explorer and Windows.

    Tools You Need For Practice
    To start with Javascript, you need a text editor of your choice including Notepad++, Visual Studio Code, Sublime Text, Atom or any other text editor to write your javascript code and a browser to display the web pages you develop.


    ECMAScript (ES) is a standard which provides scripting language like JavaScript, Jscript and ActionScript, specification controlled by ECMAScript International. If you want to learn more about ES6 then please click here. It is also called ECMAScrip 2015.

    ECMA Script6 (es6) implementation covers the following new features:

    1. Support for "const" and "let"
    2. Arrow Functions
    3. Template Literals
    4. Extended Parameter Handling
    5. Enhanced Object Properties
    6. Modules
    7. Classes
    8. Iterators
    9. Generators
    10. Collections
    11. New built in methods for various classes

    In principle, JavaScript and ECMAScript point the same thing. But you can understand the only difference below:

    The term JavaScript refers to the language and its implementations.
    The term ECMAScript refers to the language standard and language versions.


    Is Javascript Case Sensitive Programming Language:

    Yes! JavaScript is a case-sensitive language, means that the keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters. For example, Studyrightnow, studyRightnow, STUDYRIGHTNOW are three distinct variable or identifier names in javascript programming language.

    Look here we will explain it with the help of below example:

     

      <html>
      
      <body>
      
      <h3>My favorite tutorials online</h3>
      
      </body>
      
      <head>
      
      <script language="javascript" type="text/javascript">
      
      var company, Company;
      company = "Studyrightnow";
      Company = "Studyrightnow Javascript";
      document.getElementById("srn").innerHTML = Company;
      document.getElementById("srn").innerHTML = company;
      
      </script>
      
      </head>
      
      </html>
    

    Semicolons:

    Every programmer should use semicolons because it works like the separator of each line. But in javascript we can omit semicolon if we are writing the code in separate line. Look at the following code example which code is written without semicolons.

     

      
      <head>
      
      <script language="javascript" type="text/javascript">
      
      let srn = "Studyrightnow"
      let srn1 = "Studyrightnow Javascript"
      
      </script>
      
      </head>
    
    

     

    But we must use semicolons if we want to write the code in a single line as we said above that the semicolon works as a seperator:

     

      
      <head>
      
      <script language="javascript" type="text/javascript">
      
      let srn = "Studyrightnow";  let srn1 = "Studyrightnow Javascript";
      
      </script>
      
      </head>