Описание тега delphi-units

Delphi units are source code modules (text files with.pas extension) that are compiled individually to form an application. They are composed of four mandatory sections: header, interface, implementation, and closure; and by another two optional sections: initialization and finalization.

Example of the syntax of a unit:

unit UnitName; // Header section (mandatory)

interface // Interface section (mandatory)    
// Used to define required other units, constants, types, global variables, methods

implementation // Implementation section (mandatory)
// Implementation of the declared procedures and functions (methods)

initialization // Initialization section (optional)
// Sentences to be executed the first time that unit is referenced

finalization // Finalization section (optional)
// Sentences to cleanup allocated memory or freeing locked resources

end. // Closure section (mandatory)