var <variable-name> = <value>;
Example: Variable declaration & initialization:
var one = 1; // variable stores numeric value
var two = 'two'; // variable stores string value
var three; // declared a variable without assigning a value;
In the above example, we have declared three variables using var keyword: one, two and three. We have assigned values to variables one and two at the same time when we declared it. whereas variable three is declared but does not hold any value yet, so it’s value will be ‘undefined’.
Declare Variables in a Single Line
Multiple variables can also be declared in a single line separated by comma.
var one = 1, two = 'two', three;
Declare a variable without var keyword
one = 1;
two = 'two';
It is Not Recommended to declare a variable without var keyword. It can accidently overwrite an existing global variable.
C# or Java has strongly typed variables. It means variable must be declared with a particular data type. which tells what type of data the variable will hold.
var one = 1; // numeric value
one = 'one'; // string value
one = 1.1; // decimal value
one = true; // boolean value
one = null; // null value
Points to Remember:
- Variable stroes a single data value that can be changed later.
- Variables can be defined using var keyword. variables defined without var keyword become global variables.
- Variables must be initialized before using.
- Multiple variables can be defined in a single line e, g, var = 1, two = 2, three = “three”;
I hope this lesson is helpful to you.
Always be happy and proud.
And don’t give up trying