For loops in plain Solidity suck. Here's how to unsuck them. This guide contains 6 loop optimization techniques. We'll illustrate them by going through 3 example for loops. As the guide progresses we will be turning up the craziness and turning down the readability, all in the noble goal of saving gas. Vanilla Loop First off, this is your normal for loop in Solidity. This one is purposefully simple: it just adds the numbers from 0 to 99 together and returns their sum. // 37628 gas function loop() public returns (uint256 sum) { for(uint256 n = 0; n < 100; n++) {