- module my.package;
- import my.package;
- import my.package : function;
- import fancyName = mypackage;
- import my.package : fancyFunctionName = function;
Modules automatically provide a namespace scope for their contents. Modules superficially resemble classes, but differ in that:
- There's only one instance of each module, and it is statically allocated.
- There is no virtual table.
- Modules do not inherit, they have no super modules, etc.
- Only one module per file.
- Module symbols can be imported.
- Modules are always compiled at global scope, and are unaffected by surrounding attributes or other modifiers.
- Modules can be grouped together in hierarchies called packages.
Modules offer several guarantees:
- The order in which modules are imported does not affect the semantics.
- The semantics of a module are not affected by what imports it.
- If a module C imports modules A and B, any modifications to B will not silently change code in C that is dependent on A.