JavaScript - Data Types

It is not necessary to define the data type when initializing the variables in Javascript. It automatically gets the data type of the variable according to the value stored in the variable. That is calling Dynamic Type Variables. Therefore Same  variable can be used to store following kind of data in JavaScript
1. String
    A set of characters can be stored by putting between the Double Quotes or Single Quote
    Syntax:
    var <variable name> = '<Value>' OR
    var <variable name> = "<Value>"

    Ex:
    var student = "John"; // OR
    var student = 'John';   

    var Relationship= "John's car"; // Can put single Quotes within Double Quotes 
    var car = 'John has "Toyota" car'; // Can put Double Quotes within Single Quotes

2. Number
    Numbers in the can be written with or without decimal places.
    var no1 = 50;
    var no1 = 53.25;

Javascript - Comments

We are using comments to make Javascript more readable and comments are not executed by JavaScript. That can be used to explain the coding. In JavaScript, there are two types of comments can be used,
01. Single Line Comments
      Single Line Comments begins with 02 forward slashes and there is no ending, its 
      applicable to the whole line which it puts.
      Syntax:
      // <Comment>

      Ex:
      // This is a single line Comment
      var no = 0; // This is Number type variable

02. Multi Line Comments
      Multi Line Comments begins with a /* and ends with */. 
      Syntax:
      /* <Comment> */

      Ex:
      /* This is a Multi line Comment
          Purpose of this comment is explain 
          the code with more than one line */