Aptos Move by Example
  • 🚀Getting Started
  • Set-Up
  • Why is Move Secure
    • Move prover
  • Move vs Solidity
    • Resources
    • Parallel Processing
    • Reentrancy attacks
    • Memory management
    • Smart contract verification
    • Compiled language
  • Basic Concepts
    • Move.toml
    • Primary data-types
    • Strings
    • Comments
    • Functions
    • Function Visibilities
    • Control flow and expressions
    • Loops
    • Error
    • Struct and its Abilities
    • Scripts
    • Operations
  • Intermediate Concepts
    • Local variables
    • Constants
    • Signer
    • Vector
    • Address
    • Uses and Aliases
    • Maps
    • Hash functions
    • References
    • Unit test
    • Generics
    • Type Arguments
    • Type Inference
  • Advanced Concepts
    • Global Storage Structure
    • Global Storage Operations
    • Phantom Type Parameters
    • Timestamps
    • Ownership
    • Move coding conventions
    • View functions
    • Aptos account
    • Aptos Coin
    • Aptos Token(Nft)
    • Object
    • Token V2
  • Applications
    • First App
    • ToDoList
    • Voting System
    • Basic Tokens
    • Storage using Generics
    • Company
    • Collection
    • Football Card
    • Staking Module
    • MultiSender Wallet
    • English Auction
    • Dutch Auction
    • Attendance Sheet
    • Polling Contract
    • Lottery Contract
  • Decentralized Finance
    • Simple Swap Protocol Contract
    • Code of Swapping Protocol
  • Hacks
    • Coming soon
  • Hands on tutorials
    • Indexer tutorials
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  1. Basic Concepts

Scripts

Scripts are executable entrypoints similar to a main function in a conventional language. A script typically calls functions of a published module that perform updates to global storage. Scripts are ephemeral code snippets that are not published in global storage.

A Move source file (or compilation unit) may contain multiple modules and scripts. However, publishing a module or executing a script are separate VM operations.

Syntax

A script has the following structure:

script {
    <use>*
    <constants>*
    fun <identifier><[type parameters: constraint]*>([identifier: type]*) <function_body>
}

A script block must start with all of its use declarations, followed by any constants and (finally) the main function declaration. The main function can have any name (i.e., it need not be called main), is the only function in a script block, can have any number of arguments, and must not return a value. Here is an example with each of these components:

script {
    // Import the debug module published at the named account address std.
    use std::debug;

    const ONE: u64 = 1;

    fun main(x: u64) {
        let sum = x + ONE;
        debug::print(&sum)
    }
}

Scripts have very limited power—they cannot declare friends, struct types or access global storage. Their primary purpose is to invoke module functions.

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Last updated 2 years ago