JavaScript Variable: Declare, Assign a Value Part 2

Variables are used to store values (name = "John") or expressions (sum = x + y).

Declare Variables in JavaScript

Before using a variable, you first need to declare it. You have to use the keyword var to declare a variable like this

JavaScript Variable  Declare Assign a Value

 

var name;

Assign a Value to the Variable

You can assign a value to a variable when declaring a variable or after declaring a variable

 

var name = "John";

OR

 

var name;


name = "John";

Naming Variables

Although you can name the variables as you wish, it is a good programming practice to name the variables descriptively and meaningfully. In addition, variable names must begin with a letter and are sensitive. Therefore the variable student name and student name are different because the letter n in the name is different (n and N).

Try this yourself:

 

<html> <head> <title>Variables!!!</title> <script type="text/javascript"> var one = 22; var two = 3; var add = one + two; var minus = one - two; var multiply = one * two; var divide = one/two; document.write("First No: = " + one + "<br />Second No: = " + two + " <br />"); document.write(one + " + " + two + " = " + add + "<br/>"); document.write(one + " - " + two + " = " + minus + "<br/>"); document.write(one + " * " + two + " = " + multiply + "<br/>"); document.write(one + " / " + two + " = " + divide + "<br/>"); </script> </head> <body> </body> </html>

JavaScript Variable  Declare Assign a Value

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