What Are the Gas Optimization Techniques in Solidity?

Problem Faced:
Ethereum transactions consume gas, and inefficient smart contract code leads to high gas costs for users.

Solution:
Here are a few gas optimization techniques:

• Use calldata Instead of memory – Reduces gas cost by using external function parameters efficiently.
• Minimize Storage Reads/Writes – Store values in memory variables instead of re-reading from storage.
• Use Fixed-Size Arrays – Dynamic arrays require more computation and cost more gas.
• Remove Unused Variables – Solidity allocates gas for unused variables unnecessarily.
• Packing Storage Variables – Use uint256 wisely, aligning types together for efficient storage use.

solidity

// Using calldata instead of memory
function optimizedFunction(uint256[] calldata data) external pure returns (uint256) {
    return data.length; 
}

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