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 FileMaker Pro Custom Functions

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Luhn ( number )

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  Average rating: 3.9  (43 votes)
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Geoff Wells, DataIsland Software LLC
http://www.dataisland.com

The Luhn Mod-10 algorithm used to validate credit card numbers

Sample Input:
Luhn ( 123456782 )
Sample Output:
1
// This is a valid Mod 10 number


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Description:

The Luhn Mod-10 algorithm is used to validate ( check for input errors ) of many credit cards and Canadian Social Security numbers.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it

Discuss:

This function is perfect. Thank you for your good comments.

Chris, NY
July 15, 2009 9:29am

Works great (once I realized I needed to put in 'number' as a parameter for Luhn, 'doubleEven' for LuhnProduct; and 'makeEven' for LuhnDoubleEven).

Dave C., Vancouver, Canada
May 01, 2015 1:53pm

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