How to properly name properties that return true or false?

Prefixes is, has, or can are used to explicitly indicate that a property returns a boolean value and describes a state or capability.

• is - for describing a state (e.g., isLoggedIn, isLoading).

  // Property indicating loading state
  bool isLoading = true;
  

• has - for checking the presence of something (e.g., hasData, hasChanges).

  // Property checking for data presence
  bool hasData = data != null;
  

• can - for checking the possibility of performing an action (e.g., canEdit, canDelete).

  // Property checking editing capability
  bool canEdit = user.role == UserRole.admin;