hard to find good and practical rxjs examples in the wild.
below is an article about: "Higher-Order Observable Mapping"
https://blog.angular-university.io/rxjs-higher-order-mapping/
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"A very common use case for switchMap is a search Typeahead."
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"exhaustMap would be used to ignore future button clicks if the network request is still pending."
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other map operations described in that article:
concatMap, mergeMap