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Types · easy

10. Structs and enums

Grouping related state and modelling states.

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A `struct` groups related fields into one type; an `enum` gives names to a small set of states and is stored as an integer.

solidity
enum Status { None, Active, Closed }

struct Stake {
    uint256 amount;
    uint64 since;
    Status status;
}

mapping(address => Stake) public stakes;

Order struct fields so small types sit together — the compiler packs them into shared 32-byte slots and saves gas.

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Check your understanding

  1. 1. How is an enum stored?

  2. 2. Why does struct field order matter?

  3. 3. What is the default value of `Status status`?

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