Lesson 1Common contract patterns: Ownable, Pausable, ReentrancyGuard, Pull over Push payments, Checks-Effects-Interactions patternExplore foundational smart contract patterns dat improve safety an' maintainability. Yuh gwine implement Ownable, Pausable, an' ReentrancyGuard, an' apply Pull over Push an' Checks-Effects-Interactions inna real payment flows, mi bredda.
Implementing an' using Ownable access controlPausable contracts an' emergency stopsReentrancyGuard an' reentrancy attack defensePull over Push payment flow designChecks-Effects-Interactions best practicesLesson 2Safe math an' overflow protections inna Solidity 0.8+: built-in checks vs. explicit libraries (OpenZeppelin SafeMath history)Study how Solidity 0.8+ built-in overflow checks change arithmetic safety. Compare older SafeMath-style libraries wid modern patterns, an' learn when unchecked blocks safe fi gas-efficient arithmetic operations, yuh know.
Integer overflow an' underflow fundamentalsBuilt-in arithmetic checks inna Solidity 0.8+Legacy SafeMath libraries an' migrationUsing unchecked blocks safely fi gasTesting arithmetic edge cases an' limitsLesson 3State variables, storage vs memory, events, modifiers, an' error handling (require, revert, assert, custom errors)Master how Solidity stores an' accesses data using state variables, storage, memory, an' calldata. Learn to emit events, write reusable modifiers, an' apply require, revert, assert, an' custom errors fi clear error handling, seen.
State variables an' storage slotsStorage vs memory vs calldata usageDesigning an' emitting useful eventsWriting reusable an' safe modifiersRequire, revert, assert, an' custom errorsLesson 4Function visibility an' mutability: public, external, internal, private; view, pure, payableClarify how function visibility an' mutability affect security, gas, an' usability. Learn when to use public, external, internal, an' private, an' how view, pure, an' payable influence state changes an' value transfers, yuh zeet.
Public vs external function trade-offsInternal an' private fi encapsulationView an' pure fi read-only logicPayable functions an' ETH transfersDesigning clear an' safe APIsLesson 5Designing deposit/withdraw accounting: mapping(address => uint256) balances, events fi deposits/withdrawals, handling multiple tokens vs single-token vaultsLearn how to design safe deposit an' withdrawal flows using mappings, events, an' token interfaces. Compare single-token an' multi-token vaults, an' handle edge cases like failed transfers an' unexpected token behavior, mi fren.
Mapping balances an' accounting invariantsEmitting events fi deposits an' withdrawalsSingle-token vault design an' interfacesMulti-token vaults an' token identifiersHandling failed transfers an' token quirksLesson 6Testing smart contracts: unit testing concepts, fixtures, mocks fi ERC-20 tokens, an' test structure (arrange-act-assert)Learn how to test smart contracts wid a structured approach. Yuh gwine write unit tests, use fixtures an' mocks fi ERC-20 tokens, follow arrange-act-assert, an' cover edge cases, reverts, an' event expectations, yuh hear.
Testing frameworks an' project setupArrange-Act-Assert test structureUsing fixtures fi repeatable stateMocking ERC-20 tokens an' behaviorsTesting reverts, events, an' edge casesLesson 7Solidity language basics: syntax, types, visibility, inheritance, an' compiler pragmas (0.8.x specifics)Build a solid grasp of Solidity syntax, types, an' visibility rules. Explore inheritance, interfaces, compiler pragmas, an' 0.8.x specifics such as custom errors an' improved type safety fi modern smart contract development, right.
Source files, contracts, an' basic syntaxValue types, reference types, an' arraysFunction an' state variable visibilityInheritance, interfaces, an' abstract contractsCompiler pragmas an' 0.8.x language changesLesson 8Contract upgradeability basics an' trade-offs: proxy patterns (transparent, UUPS) an' when to avoid upgrades fi simple vaultsUnderstand when an' how to upgrade contracts using proxy patterns. Compare transparent an' UUPS proxies, storage layout constraints, an' governance risks, an' see why simple vaults may be safer without upgradeability, yuh see.
Why upgrade contracts an' when to avoid itTransparent proxy architecture an' rolesUUPS proxy pattern an' upgrade functionsStorage layout compatibility an' pitfallsSecurity an' governance risks of upgradesLesson 9Gas optimization basics: storage layout, packing, minimizing external calls, an' using calldataLearn practical gas optimization techniques fi Solidity contracts. Yuh gwine analyze storage layout an' packing, reduce expensive external calls, leverage calldata, an' measure gas usage to guide safe micro-optimizations, mi man.
Understanding gas costs an' refundsStorage layout an' variable packingMinimizing external an' cross-contract callsUsing calldata fi cheap read-only inputsMeasuring an' benchmarking gas usageLesson 10ERC-20 token standard deep dive: interfaces (IERC20), allowances, approve/transferFrom semantics, return value handling an' non-standard tokensDive deep into di ERC-20 standard, focusing on di IERC20 interface, balances, allowances, an' approve/transferFrom flows. Learn to handle return values, non-standard tokens, an' safe interaction patterns inna production contracts, seen.
IERC20 interface an' required functionsBalances, totalSupply, an' decimals handlingApprove an' transferFrom allowance workflowDealing wid non-standard ERC-20 tokensSafe ERC-20 interactions wid helper libraries
