Try-catch in Solidity
Solidity only had limited exception handling capabilities in the form of require, assert, and revert functions prior to version 0.6.0. Solidity introduced the much-needed try-catch functionality for implementing exception handling in contracts. The concept of try-catch is quite simple. There is a try block associated with a function call. This function should be an external function. If the called external function does not produce an error, the try block is executed. Execution of code in the try block means there have been no exceptions. Immediately following the try block is the catch block and the code within the catch block is executed in the case of revert (exception) from the target function. The try and catch blocks execution are mutually exclusive. Either the try block or catch block will get executed.
The syntax of try-catch is shown next:
Try <<function call>> returns (<<return values from   function call>>...
