Do I need to initialize the 'i' variable in a for loop?

Question

Do I need to explicitly initialize the 'i' variable in a for loop? Since i is a uint and its default value is 0, why should I spend gas in a MSTORE operation to initialize the variable with 0? The same question applies to result.

function sum10() external pure returns (uint256) {
    uint256 result;
    for(uint256 i; i< 10; i++){
       result += i;
    }
    return result;
}

Answer 1

This kind of things are simply easiest to try out in something like Remix.

I tried all three variants: as-is, explicitly setting i and explicitly setting result . The first two cost the same (25315), and the last one costs 25323.

Honestly, I'm really not sure why it's like this.