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Solidity

Solidity : View-function should not change state

Overview

In Solidity, functions that do not read from the state or modify it can be declared as view.

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See also

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Solidity : Return value of transfer, transferFrom, or approve function of ERC-20 standard is always false.

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Solidity : Using approve function of the ERC-20 token standard

Solidity

Solidity : ERC-20 transfer should throw