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Introduction To JavaScript - Created By Brandon Eich

What Is JavaScript?

What Is JavaScript?


  • JavaScript is a high-level un-typed and interpreted programming language.
  • Despite some naming, synthetic and standard library similarities, JavaScript and Java are otherwise unrelated.

History of JavaScript:

    History of JavaScript:
  • JavaScript was created in 10 days in May 1995 by Brandon Eich then working at Netscape and now of Mozilla.
  • The original name of JavaScript was Mocha (a name chosen by the founder of Netscape).
  • In September 1995 name changed to live script.
  • Again in December 1995 name change to JavaScript.

Why JavaScript?

  • JavaScript is used in web pages to add functionality validate forms communicating with the server and read-write HTML elements.
  • JavaScript is a client side scripting language. 

JavaScript interpreter:

  • As a browser goes through JavaScript, it to a special program called interpreter which converts the JavaScript to the machine code your computer understands.
  • Browsers come equipped with JavaScript interpreters.
Where to write code?
  • In the same HTML file.
  • In a separate file that can be embedded into HTML file.
In HTML file:
<script type="text/javascript">
....
....
</script> 

In External file:
External script cannot contain the <script></script> tags!. 


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