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Asia/Shanghai |
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自我介绍
2021 接触 Solidity，从合约到全端完成了 3 个 NFT 项目，ex-Tech lead 链游
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你认为你会完成本次残酷学习吗？
必须的
Solidityis a programming language for Smart Contract development on EVM (Ethereum Virtual Machine).Remixis a browser-based IDE (Integrated Development Environment) for Solidity development, it have file management, compiler, deployment, interaction and various plugins available.- A Solidity Smart Contract consists of 3 parts: License type, Solidity version and contract logics.
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3 types of Variable: Value, Reference and Mapping
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Value types:
boolBooleanuintUnsigned integerintSigned integeraddressAddressbytesVariable-length bytes arraysbyteFixed-length byt arraysenumEnumeration
Format of a function
function <function name>(<parameter types>) [public|private|external|internal] [pure|view|payable] [returns (<return types>)]
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Function visibility specifiers
public: Accessible to allprivate: Can only be called within this contractinternal: Can be called within this contract and contracts deriving from itexternal: Can only be called by external
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Function behavior specifiers
pure: Cannot read or write stateview: Read only, doesn't change statepayable: Allow contract to receive native currency
function testReturn() public pure returns (uint256) {
return 1;
}
returnsused to indicate how many and what type of variable for outputreturnused to output the desired value, and must matched to thereturnsrequirements- Named returns: Naming the output variables, eg:
function testReturn() public pure returns (uint256 one, uint256 two) { one = 1; two = 2; } - To read variables return from function
or
(uint256 one, uint256 two) = testReturn();(, uint256 two) = testReturn();