September 2019
Beginner to intermediate
540 pages
13h 3m
English
Content preview from Learn Ethereum
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The pure, view, and payable functions
Functions can be declared as pure, view, or payable, depending on whether it can receive ether or if it needs to access the state. Some earlier versions of Solidity had a constant as the alias to view, but it was dropped in v0.5.0:
- Pure function: A pure function means it won't read or modify the state.
- View function: A view function means it won't modify the state.
- Payable function: A payable function means it can receive ether.
The state means anything EVM holds beyond the input parameters, including state variables, events, contracts, ether, and more. The following are considered as modifying the state:
- Writing to or updating the state variables.
- Constructing other contracts using constructors or ...
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