Pre-Increment : Prefix operator « Operators

Pre-Increment : Prefix operator « Operators « JavaScript Tutorial

1.	Language Basics
2.	Operators
3.	Statement
4.	Development
5.	Number Data Type
6.	String
7.	Function
8.	Global
9.	Math
10.	Form
11.	Array
12.	Date
13.	Dialogs
14.	Document
15.	Event
16.	Location
17.	Navigator
18.	Screen
19.	Window
20.	History
21.	HTML Tags
22.	Style
23.	DOM Node
24.	Drag Drop
25.	Object Oriented
26.	Regular Expressions
27.	XML
28.	GUI Components
29.	Dojo toolkit
30.	jQuery
31.	Animation
32.	MS JScript

JavaScript Tutorial » Operators » Prefix operator

2.3.1.Pre-Increment

The pre-increment operator is placed directly before the variable.

The operation begins by incrementing the variable by 1.

The new incremented value is returned by the operation to be used in another expression.

If the variable is a string, it is converted to a number.

For example, the following segment of code

var price = 5

var newPrice = (++price) + 3;

the value of 9 dollars would be stored in the variable newPrice.

<html>

    <script language="JavaScript">

    <!--

    document.write("<h3>Before Pre-decrement</h3>");

    num = new String("8");

    document.write("num=",num,"<br>"); 

    returnValue = --num;

    document.write("<h3>After Pre-decrement</h3>");

    document.write("num=",num,"<br>");

    document.write("Value returned from operation is ",returnValue,"<br>");

    returnValue = num--;

    document.write("<h3>After Post-decrement</h3>");

    document.write("num=",num,"<br>");

    document.write("Value returned from operation is ",returnValue,"<br>");

    -->

    </script>

    </html>

2.3.Prefix operator
	2.3.1.	Pre-Increment
	2.3.2.	Pre-Decrement
	2.3.3.	Prefix operator: ++
	2.3.4.	Prefix operator 2: --

java2s.com | Contact Us | Privacy Policy

All other trademarks are property of their respective owners.