As we know, nowadays, we need to build Fault-Tolerant applications so that end users or customers don't feel frustrated using our application. We cannot write correct code to handle exceptions, errors, or faults and its a bit tough and not easy to do so.
It's not possible to develop a System or Application without it failing even once in its lifetime. New Systems may have more Faults (or Errors or Exceptions) and Legacy Systems may have less, but failures are common and it is expected in each and every System.
We should design and develop our Reactive Systems, Microservices, or Web Applications with failure in mind. As an Object is a first-class citizen in an Object-Oriented System, a Function is a first-class citizen in a Functional System, and a Fault-Handling Technique is a first-class citizen in a Reactive System.
In an Object-Oriented...
