What is initcode?

• Contract creation code
• Contract Constructor logic and parameters
• Generate the contract runtime bytecode
• The bytecode in Remix "Compilation details" for a contract

Runtime Bytecode

• Contract code
  • No constructor and parameters
  • This restricts constructor execution after contract deployment
• Stored on-chain
• Also known as Deployed Bytecode
• init code vs runtime code

Lab

Follow the instructions on the readme file of create2-upgrade

References

• Getting most out of CREATE2
• Deploying smart contracts using CREATE2
• Metamorphosis smart contracts using CREATE2
• EIP-1014 CREATE2
• EIP-165 Standard Interface Detection
• Solidity type information
• Salted Contract creations