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Type System · easy

2. Struct Abilities (key, store, copy, drop)

Move's four fundamental typing abilities.

1 min read3 questionsup to 50 XPtopic 2/25

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Abilities define what actions are permissible on a struct: - `key`: Allows the struct to serve as a top-level on-chain object (requires `id: UID`). - `store`: Allows the struct to be stored inside other structs or transferred freely. - `copy`: Allows the value to be cloned. - `drop`: Allows the value to be discarded/ignored when going out of scope without explicit destruction.

move
public struct Hero has key, store {
    id: UID,
    level: u64,
}

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Check your understanding

  1. 1. Which ability allows a struct to be treated as a first-class on-chain Sui Object?

  2. 2. What happens if a struct without the 'drop' ability is not consumed before going out of scope?

  3. 3. Can a digital currency/coin struct possess the 'copy' ability in Move?

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