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#ask-questions
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# ask-questions
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dazzling-fountain-5777

03/23/2023, 7:47 PM
Hi! First of all, thanks for GrowthBook! It's an amazing tool! Sorry if the question is basic, but when I'm using an A/B Experiment override rule, is there a way (a flag or something) for me to differentiate the default value from the control one? Thanks for your help!
I guess I've found it. Experiment callback functions!
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fresh-football-47124

03/23/2023, 9:13 PM
you can use GrowthBook as a full remote configuration tool
you just need to create an experiment that is not boolean, and you can pass in those values to the code
but yes, the trackingCallback is when you’ll know that a user has been exposed to an experiment - or you can use the more detailed evalFeature methods to get more details
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dazzling-fountain-5777

03/24/2023, 8:06 PM
thanks!
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