Work with Rell modules

Splitting your dapp into modules keeps the code organized and easier to maintain.

Rell lets you group code into modules. To make a file a module, put the module; keyword on its first line. The module takes its name from the file name. The exception is a file named module.rell: it turns its whole folder into a module named after that folder. You can create sub-modules in two ways: add folders inside a module, or put a module; declaration in another file in the same folder.

Consider these two layouts:

module;

The file above defines a module named main.

module;

This layout also produces a module named main.

Suppose you add a second file, src/main/bar.rell. If it has no module declaration, it joins the main module automatically. If you declare it as a module instead:

module;

Rell then creates a sub-module named main.bar.

Applying this pattern throughout your project gives you a modular codebase that is easier to navigate and maintain.