The initial order of the categories had the recently used category in the second to last position. I thought it would be a better user experience to have the recently used category be the first category since it would match the category order of our web emoji keyboard and it is also the same order that the native iPhone emoji keyboard uses:

This is a constant, so instead of memoizing it you can just declare it in the top-level scope. Any time you define a React.useMemo with no deps in the dep list, that's usually a sign that you should be declaring at the top-level scope instead

(Let me know if this is modified later though)