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solidity

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Notes on Solidity

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# Notes on Solidity

Solidity is an object-oriented, high-level language for implementing smart contracts. Smart contracts are programs which govern the behaviour of accounts within the Ethereum state.

Solidity was influenced by C++, Python and JavaScript and is designed to target the Ethereum Virtual Machine (EVM).

Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.

With Solidity you can create contracts for uses such as voting, crowdfunding, blind auctions, and multi-signature wallets.

When deploying contracts, you should use the latest released version of Solidity. This is because breaking changes as well as new features and bug fixes are introduced regularly.

**Documentation**:

-   Github: https://github.com/ethereum/solidity
-   Read the Docs: https://docs.soliditylang.org/en/latest/

## Solidity by Example

An introduction to Solidity with simple examples.

### Examples

v0.8.10 - [source code & license](https://github.com/solidity-by-example/solidity-by-example.github.io)

-   [Hello World](./src/0.8/00_hello-world)
-   [First App](./src/0.8/01_first-app)
-   [Primitive Data Types](./src/0.8/02_primitives)
-   [Variables](./src/0.8/03_variables)
-   [Constants](./src/0.8/04_constants)
-   [Immutable](./src/0.8/05_immutable)
-   [Reading and Writing to a State Variable](./src/0.8/06_state-variables)
-   [Ether and Wei](./src/0.8/07_ether-units)
-   [Gas and Gas Price](./src/0.8/08_gas)
-   [If / Else](./src/0.8/09_if-else)
-   [For and While Loop](./src/0.8/10_loop)
-   [Mapping](./src/0.8/11_mapping)
-   [Array](./src/0.8/12_array)
-   [Enum](./src/0.8/13_enum)
-   [Structs](./src/0.8/14_structs)
-   [Data Locations - Storage, Memory and Calldata](./src/0.8/15_data-locations)
-   [Function](./src/0.8/16_function)
-   [View and Pure Functions](./src/0.8/17_view-and-pure-functions)
-   [Error](./src/0.8/18_error)
-   [Function Modifier](./src/0.8/19_function-modifier)
-   [Events](./src/0.8/20_events)
-   [Constructor](./src/0.8/21_constructor)
-   [Inheritance](./src/0.8/22_inheritance)
-   [Shadowing Inherited State Variables](./src/0.8/23_shadowing-inherited-state-variables)
-   [Calling Parent Contracts](./src/0.8/24_calling-parent-contracts)
-   [Visibility](./src/0.8/25_visibility)
-   [Interface](./src/0.8/26_interface)
-   [Payable](./src/0.8/27_payable)
-   [Sending Ether - Transfer, Send, Call](./src/0.8/28_sending-ether)
-   [Fallback](./src/0.8/29_fallback)
-   [Call](./src/0.8/30_call)
-   [Delegatecall](./src/0.8/31_delegatecall)
-   [Function Selector](./src/0.8/32_function-selector)
-   [Calling Other Contract](./src/0.8/33_calling-other-contract)
-   [Creating Contracts from a Contract](./src/0.8/34_new-contract)
-   [Try / Catch](./src/0.8/35_try-catch)
-   [Import](./src/0.8/36_import)
-   [Library](./src/0.8/37_library)
-   [ABI Encode](./src/0.8/38_abi-encode)
-   [ABI Decode](./src/0.8/39_abi-decode)
-   [Hashing with Keccak256](./src/0.8/40_hashing)
-   [Verifying Signature](./src/0.8/41_signature)
-   [Gas Optimizations](./src/0.8/42_gas)
-   [Bitwise Operators](./src/0.8/43_bitwise-operators)

### Applications

-   [Ether Wallet](./src/0.8/app/00_ether-wallet)
-   [Multi Sig Wallet](./src/0.8/app/01_multi-sig-wallet)
-   [Merkle Tree](./src/0.8/app/02_merkle-tree)
-   [Iterable Mapping](./src/0.8/app/03_iterable-mapping)
-   [Precompute Contract Address with Create2](./src/0.8/app/04_create2)
-   [ERC20](./src/0.8/app/05_erc20)
-   [ERC721](./src/0.8/app/06_erc721)
-   [Minimal Proxy Contract](./src/0.8/app/07_minimal-proxy)
-   [Upgradeable Proxy](./src/0.8/app/08_upgradeable-proxy)
-   [Deploy Any Contract](./src/0.8/app/09_deploy-any-contract)
-   [Write to Any Slot](./src/0.8/app/10_write-to-any-slot)
-   [Uni-Directional Payment Channel](./src/0.8/app/11_uni-directional-payment-channel)
-   [Bi-Directional Payment Channel](./src/0.8/app/12_bi-directional-payment-channel)
-   [English Auction](./src/0.8/app/13_english-auction)
-   [Dutch Auction](./src/0.8/app/14_dutch-auction)
-   [Crowd Fund](./src/0.8/app/15_crowd-fund)
-   [Multi Call](./src/0.8/app/16_multi-call)
-   [Multi Delegatecall](./src/0.8/app/17_multi-delegatecall)
-   [Time Lock](./src/0.8/app/18_time-lock)

### Hacks

-   [Re-Entrancy](./src/0.8/hacks/00_re-entrancy)
-   [Arithmetic Overflow and Underflow](./src/0.8/hacks/01_overflow)
-   [Self Destruct](./src/0.8/hacks/02_self-destruct)
-   [Accessing Private Data](./src/0.8/hacks/03_accessing-private-data)
-   [Delegatecall](./src/0.8/hacks/04_delegatecall)
-   [Source of Randomness](./src/0.8/hacks/05_randomness)
-   [Denial of Service](./src/0.8/hacks/06_denial-of-service)
-   [Phishing with tx.origin](./src/0.8/hacks/07_phishing-with-tx-origin)
-   [Hiding Malicious Code with External Contract](./src/0.8/hacks/08_hiding-malicious-code-with-external-contract)
-   [Honeypot](./src/0.8/hacks/09_honeypot)
-   [Front Running](./src/0.8/hacks/10_front-running)
-   [Block Timestamp Manipulation](./src/0.8/hacks/11_block-timestamp-manipulation)
-   [Signature Replay](./src/0.8/hacks/12_signature-replay)
-   [Bypass Contract size Check](./src/0.8/hacks/13_bypass-contract-size-check)

### Tests

-   [Echidna](./src/0.8/tests/echidna)

### DeFi

-   [Uniswap V2 Swap](./src/0.8/defi/uniswap-v2)
-   [Uniswap V2 Add Remove Liquidity](./src/0.8/defi/uniswap-v2-add-remove-liquidity)
-   [Uniswap V2 Optimal One Sided Supply](./src/0.8/defi/uniswap-v2-optimal-one-sided-supply)
-   [Uniswap V2 Flash Swap](./src/0.8/defi/uniswap-v2-flash-swap)
-   [Uniswap V3 Swap](.src/0.8/defi/uniswap-v3-swap)
-   [Uniswap V3 Liquidity](./src/0.8/defi/uniswap-v3-liquidity)
-   [Uniswap V3 Flash Loan](./src/0.8/defi/uinswap-v3-flash-loan)
-   [Uniswap V3 Flash Swap Arbitrage](./src/0.8/defi/uniswap-v3-flash-swap)
-   [Chainlink Price Oracle](./src/0.8/defi/chainlink-price-oracle)
-   [Staking Rewards](./src/0.8/defi/staking-rewards)
-   [Discrete Staking Rewards](./src/0.8/defi/discrete-staking-rewards)
-   [Vault](./src/0.8/defi/vault)
-   [Constant Sum AMM](./src/0.8/defi/constant-sum-amm)
-   [Constant Product AMM](./src/0.8/defi/constant-product-amm)
-   [Stable Swap AMM](./src/0.8/defi/stable-swap-amm)

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