natzuu data for issue #480

data/natzuu-G.md

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+## G001 `++I` COSTS LESS GAS COMPARED TO `I++` OR `I += 1` (SAME FOR `--I` VS `I--` OR `I -= 1`)
+
+Pre-increments and pre-decrements are cheaper.
+
+For a `uint256 i` variable, the following is true with the Optimizer enabled at 10k:
+
+**Increment:**
+
+- `i += 1` is the most expensive form
+- `i++` costs 6 gas less than `i += 1`
+- `++i` costs 5 gas less than `i++` (11 gas less than `i += 1`)
+
+**Decrement:**
+
+- `i -= 1` is the most expensive form
+- `i--` costs 11 gas less than `i -= 1`
+- `--i` costs 5 gas less than `i--` (16 gas less than `i -= 1`)
+
+[https://github.com/code-423n4/2022-08-olympus/blob/b5e139d732eb4c07102f149fb9426d356af617aa/src/policies/Operator.sol#L488](https://github.com/code-423n4/2022-08-olympus/blob/b5e139d732eb4c07102f149fb9426d356af617aa/src/policies/Operator.sol#L488)
+
+```solidity
+decimals++;
+```
+
+# ****G002 - Cache Array Length Outside of Loop****
+
+### **Description**
+
+Caching the array length outside a loop saves reading it on each iteration, as long as the array's length is not changed during the loop.
+
+[https://github.com/code-423n4/2022-08-olympus/blob/b5e139d732eb4c07102f149fb9426d356af617aa/src/policies/Governance.sol#L278](https://github.com/code-423n4/2022-08-olympus/blob/b5e139d732eb4c07102f149fb9426d356af617aa/src/policies/Governance.sol#L278)
+
+```solidity
+for (uint256 step; step < instructions.length; ) {
+```
+
+Background info
+
+[https://github.com/code-423n4/2021-11-badgerzaps-findings/issues/36](https://github.com/code-423n4/2021-11-badgerzaps-findings/issues/36)
+