What are the ways to handle errors in Swift?

When a error is thrown, there must be a piece of code dedicated to handle the error thrown. Swift provides four possible ways to handle errors. They are as follows:

• We can propagate the error from the function to the code that calls the function.
• Use a try! or try?..do..catch statement
• Handle the error as optional value
• Assert that the error will not happen

How to propagate error from a function using throw keyword…