Understanding return

Returning data is an integral part of a Solidity function. Solidity provides two different syntaxes for returning data from a function. In the following code sample, two functions – getBlockNumber and getBlockNumber1 – are defined. The getBlockNumber function returns uint without naming the return variable. In such cases, developers can resort to using the return keyword explicitly to return from the function.

The getBlockNumber1 function returns uint and also provides a name for the variable. In such cases, developers can directly use and return this variable from a function without using the return keyword, as shown in the following code listing:

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;
contract ReturnValues {
    uint counter;
    function setNumber() public {
       counter = block.number;
    }
   ...