Standard Library

Similar to Rust, Sway comes with its own standard library.

The Sway Standard Library is the foundation of portable Sway software, a set of minimal shared abstractions for the broader Sway ecosystem. It offers core types, like Result<T, E> and Option<T>, library-defined operations on language primitives, native asset management, blockchain contextual operations, access control, storage management, and support for types from other VMs, among many other things.

The entire Sway standard library is a Forc project called std, and is available directly here: https://github.com/FuelLabs/sway/tree/master/sway-lib-std (navigate to the appropriate tagged release if the latest master is not compatible).

Using the Standard Library

The standard library is made implicitly available to all Forc projects created using forc init. In other words, it is not required to manually specify std as an explicit dependency. Forc will automagically use the version of std that matches its version.

Importing items from the standard library can be done using the use keyword, just as importing items from any Sway project. For example:

use std::address::Address;

This imports the Address type into the current namespace.