jquery call function from string variable

I'm editing the main post, originally I was checking a way to dynamically call function name beginning from a couple of strings. Specifically I had a prefix and a variable string based on a text list. Actually I get this words by a table, my purpose is create filters for the datatable jquery object. However I solved with the eval method like this:

var fn = 'my_foo';

I really have to say I thought to have fixed my issue, but eval is a bad practise for security risks and majorly I'm still not able to test if dynamic function name exists. I have tried $isFunction, window[myname], typeof myname === 'function', nothing of the constructs above works. I also have tried $ instead of window since I'm using jquery and webpack. I'm driving crazy please help.

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