Functions

Move functions are similar to Solidity functions, but default visibility and transaction entry points work differently.

Function categories

1. fun is private by default.
2. public entry fun is the equivalent of a transaction-callable external method.
3. #[view] public fun is the equivalent of a read-only public method callable without a transaction.

Entry functions

function addMessage(string memory messageText_) external {
    // ...
}

public entry fun add_message(sender: &signer, message: String) {
    // ...
}

• public entry makes the function transaction-callable.
• &signer gives you the authenticated sender instead of msg.sender.
• In current Move, you do not need an acquires annotation for this pattern.

View functions

function getMessages() external view returns (Message[] memory) {
    // ...
}

#[view]
public fun get_messages(): vector<Message> {
    // ...
}

Visibility difference that trips people up

In Solidity you often start from public and restrict only when needed. In Move, start from private fun and expose only what the module truly needs to expose.