Popular interview question: how to diagnose a mysterious process that’s taking too much CPU, memory, IO, etc?

This diagram is from Brendan Gregg's book: Systems Performance.

Can use service provider for @service

Most of all it's going to be worth it...

Bug with the delete keyword :-
It deletes the elements value but never deletes the memory occupied that's why length is the same

To find the index of an array in javascript we have FindIndex();

If the index is not available we will get -1 as an index (written interview question )