switching values with 3rd variable 1

onressy · Jan 18, 2007

Hi i'm trying something and am wonder what the most effecient way to switch the value of two variables without creating a third variable, and also so that its dynamic, meaning what ever the values or a or b are it will work:

var a = 3;
var b = 5;

// so the result will be b=3 and a=5, again without the use of a third variable

Any suggestions?

Thanks

kaht · Jan 18, 2007

Provided that you're using numbers, you can use this method (note that it won't work with strings or most other data types)

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "[URL unfurl="true"]http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">[/URL]
<html xmlns="[URL unfurl="true"]http://www.w3.org/1999/xhtml">[/URL]
<head>
<title>test</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<script type="text/javascript">

var a = 5;
var b = 3;
alert("Values before swap\n\na: " + a + "\nb: " + b);
[gray][i]//here's the swapping magic[/i][/gray]
[!]a = a + b;
b = a - b;
a = a - b;[/!]
alert("Values after swap\n\na: " + a + "\nb: " + b);

</script>
<style type="text/css"></style>
</head>
<body>
</body>
</html>

-kaht

http://www.silkypups.com

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switching values with 3rd variable 1

onressy

Programmer

kaht

Programmer

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