JAVASCRIPT DATA TYPES
JAVASCRIPT DATA TYPES
- By Mohammad --
- Monday, 31 May, 2021
JAVASCRIPT DATA TYPES
In javascript we define values to javascript variables we may define any value to that variable, if you want to know which type of data it is known by command of "typeof"
In JavaScript there are 7 types of data types are present
Example to know the defined variable value is which data type:
<html>
<head>
SCRIPT
var x=10;
Document.write(typeof x);
/SCRIPT
</head>
<body>
</html>
7 TYPES OF DATA TYPES ARE THERE
1. STRING [ String means charecters of sequence ]
Example :
<html>
<head>
SCRIPT
var x='AMD';
Document.write(typeof x);
/SCRIPT
[ or ]
SCRIPT
var x='10';
Document.write(typeof x);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : String [for both above scripts]
Note : While you defining variable value if you define the value in Single quote or Double Quote that becomes string.
2.NUMBER
Example :
<html>
<head>
SCRIPT
var x=10;
var y=10.10;
Document.write(typeof x);
Document.write(typeof y);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : Number.
3.BOOLEAN
Example :
<html>
<head>
SCRIPT
var x=true/false; [Output : Boolean]
var x=3>2; [Output : True]
var x=2>3; [Output : false]
Document.write(typeof x);
Document.write(typeof y);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : boolean
4.ARRAY
Example :
<html>
<head>
SCRIPT
var x=['a','b'];
Document.write(typeof x);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : In any language if you print array data type that will give type as array, but in javascript while you print array data type it will gavie array data type as object [why t shows like this will discuss in array section].
5.OBJECT
Example :
<html>
<head>
SCRIPT
var x={'a':10,'b':15};
Document.write(typeof x);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : OBJECT. [ Will discuss about it clearly in OOPS Concept.]
6.NULL
Example :
<html>
<head>
SCRIPT
var x;
Document.write(typeof x);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT: OBJECT.
7.UNDEFINED
Example :
<html>
<head>
SCRIPT
var x;
Document.write(typeof x);
/SCRIPT
</head>
<body>
</body>
</html>
OUTPUT : UNDEFINED.
These are the Main Data types which are using in JAVASCRIPT. [In case of ARRAY,OBJECT,NULL you may have dought of output is getting as Data type of OBJECT but actually which type of data type it is actually we are not getting in future topics i will clearly explain about it keep following.
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