Padrões de Proxy: Implementação e Práticas — Forge College

Want to understand why updatable proxies are essential for scalable Solidity architectures and how to avoid subtle storage corruption? In this hands-on lesson, you'll implement a minimal proxy and test firsthand how delegatecall preserves the storage layout. What you'll learn: You'll implement a proxy + implementation pair with contracts/Logic.sol and contracts/Proxy.sol files and a test in test/proxy.test.js using Hardhat. The lesson shows how to store the implementation address in the proxy to avoid storage collisions, how to forward calls with delegatecall preserving selectors and calldata, and how to inspect storage slots or create views to prove that the state belongs to the proxy. We also cover gas trade-offs between direct and forwarded calls and how small layout changes cause subtle bugs that tests should detect. Who it's for: This is an advanced lesson—ideal for Solidity developers already familiar with delegatecall, storage layout, and the basic Hardhat flow. Familiarity with contracts, tests, and local deployments is recommended. Main topics covered: Implementation of a minimal proxy using delegatecall Where and how to store the implementation address to avoid collisions Tests that call functions via proxy and validate reads/writes to the proxy Inspection of storage slots and views to confirm layout preservation Gas trade-offs between direct and forwarded calls Practical files: contracts/Logic.sol, contracts/Proxy.sol, test/proxy.test.js Ready to practice and consolidate your understanding of proxies in Solidity? Access https://www.forge.college/