Add a variable to a class instance at runtime: Difference between revisions

Unicon implements object environments with records and supporting procedures for creation, initialization, and methods. To modify an instance you must create a new record then copy and amend it. The procedures ''constructor'' and ''fieldnames'' are needed. This example doesn't do error checking. Here ''extend'' takes three arguments, the class instance, a list of new variable names as strings, and an optional list of new values to be assigned. As written this isn't safe from name collisions - aside from local declarations the use of a fixed constructor name uses the global name space.