he/him 
I like to make errors like this on purpose in my material:
members.sort(sortByName()).map ...
should be:
members.sort(sortByName).map
This is such a common bug for beginners it feels good to see an instructor do it too 
HAVE YOU EVER HEARD OF TYPE SYSTEMS RYAN, THIS WOULD HAVE CAUGHT THAT ERROR UGHHH
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Unless the function you pass in returns a function...
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