Abstract: Neither the Add a checksum nor the Data Validator step provide calculation or check for EAN / UPC checkdigit.
Authors: Ludwig Weiss
License: LGPL
Kettle version: Kettle 3.2.5 and up (and maybe also a bit down?)

In a Javascript step create a new Script page and mark it as Start script

paste the following code into this page

// String reverse
String.prototype.reverse =
function()
{
	splitext = this.split("");
	revertext = splitext.reverse();
	reversed = revertext.join("");
	return reversed;
}

// function to calculate EAN / UPC checkdigit
function eanCheckDigit(s)
{
	var result = 0;
	var rs = s.reverse();
	for (counter = 0; counter < rs.length; counter++)
	{
		result = result + parseInt(rs.charAt(counter)) * Math.pow(3, ((counter+1) % 2));
	}
	return (10 - (result % 10)) % 10;
}

use the function in the transform script like
```
var cd = eanCheckDigit(sUPC);
```

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