Memory: Return, Require, Tuples and Keccak256

https://github.com/RareSkills/Udemy-Yul-Code/blob/main/Video-10-Require-Return-Tuple-Keccak256.sol

Return

contract UsingMemory {

    function return2and4() external pure returns (uint256, uint256) {
        assembly {
            mstore(0x00, 2)
            mstore(0x20, 4)
            return(0x00, 0x40)        //returns 2 and 4
        }
    }
}

• return operates as a function within Yul, not as a keyword that we are used to

• return in yul returns an area in memory, specified by arguments

• return(start_mem_addr, end_mem_addr)

Revert

• like return, revert can return a specified area in memory

• revert allows for execution to be reverted, and return some data so that the calling function can respond and do something with it

• if you just want execution to stop: revert(0, 0)