Custom functions can perform calculations much faster than calcs in Scripts. We'll look at some of these, plus look at integrating with Twilio. Free Sample File: https://bit.ly/322BSEM Future live streams: https://fmtraining.tv/#LIVE

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This is a misleading statement. Custom functions do not perform calculations faster than script calculations. 

The custom functions shown for packaging and parsing multiple values in a script parameter were developed by Six Fried Rice’s Jesse Antunes and described in their blog in 2007. http://sixfriedrice.com/wp/passing-multiple-parameters-to-scripts-advanced/

It is a matter of opinion whether it is better to have visibility into the parsing of parameters vs this method of having the receiving script use a custom function to declare parameters. I would recommend using JSON to pass parameters and to declare each value in the receiving script explicitly, as it self-documents the script.