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    Implement RxJS `concatMap` by Waiting for Inner Subscriptions to Complete

    rxjsRxJS
    ^6.0.0

    Unlike mergeMap and switchMap, concatMap focuses on when "inner" subscriptions "complete" by using a "buffer". Each time concatMap receives a value, it adds each value to a "buffer", waits for previous "inner" subscription to complete, then invokes next with the next value from the "buffer".