This is a very simple technique which many of us might be using without knowing it's gas efficient.
Consider the following contracts:
contract Inc1{
uint[] public arr = [0,1,2,3,4,5,6,7,8,9,10];
uint total;
function something() external {
uint sum;
uint[] memory _arr = arr;
for (uint i; i < _arr.length; i += 1) {
sum += _arr[i];
}
total = sum;
}
}
contract Inc2{
uint[] public arr = [0,1,2,3,4,5,6,7,8,9,10];
uint total;
function something() external {
uint sum;
uint[] memory _arr = arr;
for (uint i; i < _arr.length; i++) {
sum += _arr[i];
}
total = sum;
}
}
Both the contracts have function something which iterates through the array to sum all the elements. But the difference is in the increment style of loops. Inc1 has i +=1 while Inc2 has i++
Inc1
Inc2
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