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docs(solidity-101/09_Constant): replace solidity version about immutable from v8.0.21 to v0.8.21 #232

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docs(solidity-101/09_Constant): replace solidity version about immutable from v8.0.21 to v0.8.21 #232

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2 changes: 1 addition & 1 deletion docs/solidity-101/09_Constant/readme.md
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Expand Up @@ -40,7 +40,7 @@ address constant CONSTANT_ADDRESS = 0x0000000000000000000000000000000000000000;

### immutable

`immutable`变量可以在声明时或构造函数中初始化，因此更加灵活。在`Solidity v8.0.21`以后，`immutable`变量不需要显式初始化。反之，则需要显式初始化。
`immutable`变量可以在声明时或构造函数中初始化，因此更加灵活。在`Solidity v0.8.21`以后，`immutable`变量不需要显式初始化。反之，则需要显式初始化。
若`immutable`变量既在声明时初始化，又在constructor中初始化，会使用constructor初始化的值。

``` solidity
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