GPT

Gas Optimization Patterns

// SPDX-License-Identifier: MIT pragma solidity ^0.8.24; /// @title GasOptimizationPatterns /// @notice Reference patterns for minimizing gas consumption contract GasOptimizationPatterns { // PATTERN 1: Storage packing

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/// @title GasOptimizationPatterns
/// @notice Reference patterns for minimizing gas consumption
contract GasOptimizationPatterns {
 // PATTERN 1: Storage packing — fit multiple values in one 32-byte slot
 struct PackedData {
 uint128 id; // slot 0 (16 bytes)
 uint128 amount; // slot 0 (16 bytes) — same slot!
 address owner; // slot 1 (20 bytes)
 uint96 timestamp; // slot 1 (12 bytes) — same slot!
 }

 // PATTERN 2: Custom errors save ~50 gas per revert vs require strings
 error Unauthorized(address caller);
 error InsufficientBalance(uint256 requested, uint256 available);

 // PATTERN 3: Use mappings over arrays for lookups — O(1) vs O(n)
 mapping(address => uint256) public balances;

 // PATTERN 4: Cache storage reads in memory
 function optimizedTransfer(address to, uint256 amount) external {
 uint256 senderBalance = balances[msg.sender]; // 1 SLOAD
 if (senderBalance < amount) {
 revert InsufficientBalance(amount, senderBalance);
 }
 unchecked {
 // Safe because of the check above
 balances[msg.sender] = senderBalance - amount;
 }
 balances[to] += amount;
 }

 // PATTERN 5: Use calldata for read-only external array params
 function processIds(uint256[] calldata ids) external pure returns (uint256 sum) {
 uint256 len = ids.length; // Cache length
 for (uint256 i; i < len;) {
 sum += ids[i];
 unchecked { ++i; } // Save gas on increment — cannot overflow
 }
 }

 // PATTERN 6: Prefer uint256 / int256 — the EVM operates on 32-byte words
 // Smaller types (uint8, uint16) cost extra gas for masking UNLESS packed in storage
}

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