I am trying to understand in which cases nodejs will be faster than its pros. I completely understood the terms Asynchronous I/O and non-blocking I/O but cant think of a use case where it is be useful. can somebody give me an example ?
Node is a prime example why async I/O is useful.
Node is (as far as the user is concerned) single threaded, so waiting for synchronous I/O would stop the only thread that is executing code. Since there are no guarantees how long I/O will take, that could/would make Node code run extremely slowly.
That's why Node pretty much uses only async I/O, it allows the single thread to quickly offload I/O work to the operating system while continuing code execution without interruption until the operating system notifies Node that the I/O operation is done.