JavaScript Tutorial/Operators/Postfix operator
Post-Decrement
The post-decrement operator (--) is placed to the right of a variable.
The post-decrement operator decrements the value by 1.
If the variable is a string, it is converted to a number.
2. 2. Postfix operator 2. 2. 1. <A href="/Tutorial/JavaScript/0040__Operators/PostIncrement.htm">Post-Increment</a> 2. 2. 2. Post-Decrement 2. 2. 3. <A href="/Tutorial/JavaScript/0040__Operators/Postfixoperator.htm">Postfix operator: ++</a> 2. 2. 4. <A href="/Tutorial/JavaScript/0040__Operators/Postfixoperator2.htm">Postfix operator 2: --</a>
Postfix operator: ++
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
<!--
var a = 6, b = 2;
alert(a++ + b);
alert(a);
// -->
</script>
</head>
<body>
</body>
</html>
Postfix operator 2: --
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
<!--
var a = 6, b = 2;
alert(a-- + b);
alert(a);
// -->
</script>
</head>
<body>
</body>
</html>
Post-Increment
The post-increment operator appears directly after the variable.
The operation begins by incrementing the variable by 1.
The post-increment operator returns the original value before it was incremented.
If either of the values is a string, an attempt is made to convert the string to a number.
2. 2. Postfix operator 2. 2. 1. Post-Increment 2. 2. 2. <A href="/Tutorial/JavaScript/0040__Operators/PostDecrement.htm">Post-Decrement</a> 2. 2. 3. <A href="/Tutorial/JavaScript/0040__Operators/Postfixoperator.htm">Postfix operator: ++</a> 2. 2. 4. <A href="/Tutorial/JavaScript/0040__Operators/Postfixoperator2.htm">Postfix operator 2: --</a>
