Solidity Examples

This is a collection of solidity examples that I practiced while I was learning about Solidity and writing smart contracts.

Almost all smart contracts have tests with them, so feel free to play around with them to understand more about Solidity programming language or business logic in the contract itself.

How to Run

$ npm install
$ npx hardhat test

Getting Started with Solidity

1. Data types
2. Constructors
3. Variables
4. Functions
5. Visibility
6. Pure and View
7. Function modifiers
8. Gas
9. Events
10. Error handling
11. Fallback function
12. For Loop
13. Array
14. Mapping
15. Enum
16. Struct
17. Payable modifier
18. Import into a contract
19. Contract cleanup
20. Memory vs storage
21. Inheritance
22. If statements
23. Libraries
24. Interface

Sample Apps

1. Sample Contract
2. Address Book
3. Hotel Room
4. Time lock
5. ERC20 Token
6. Shared Wallet
7. Swap Token
8. ETH Game
9. Ballot
10. Vault / Liquidity Pool
11. Flash Loan. (See more resources)
12. Uniswap - Simple Swap
13. Crowdfunding

ERC Standards

1. ERC1155 GameItems
2. ERC2612 Permit Token
3. ERC4626 Tokenized Vault

Security Patterns

1. Reentrancy Attack Demo
2. Pull Payment Auction
3. ECDSA Signature Verifier
4. Commit-Reveal Voting
5. EIP-712 Typed Data Signer

DeFi Primitives

1. Merkle Airdrop
2. Linear Vesting
3. Staking Rewards
4. Constant Product AMM
5. Bonding Curve Token

Upgradeability

1. UUPS Upgradeable Counter
2. Transparent Proxy Box
3. Minimal Diamond (EIP-2535)

Governance

1. Simple Token-Weighted DAO
2. Governor + Timelock

Account Abstraction

1. Simple Account (ERC-4337 minimal)
2. Paymaster

Road to Web3

1. NFT Smart Contract ECR-721
2. Buy Me A Coffee
3. NFTs with On-Chain Metadata
4. NFT Gallery
5. Connect APIs to your Smart Contracts using Chainlink

Solidity by Examples

1. Ether Wallet
2. Multi Sig Wallet
3. Wrapped ETH (WETH)

License

The software is available as open source under the terms of the MIT License.