TOM (object-oriented programming language)

TOM was an object oriented programming language developed in the 1990s that built upon the lessons learned from Objective-C. The main purpose of TOM was to allow for "unplanned reuse" of code via a well-developed extension mechanism. This concept was introduced seemingly by accident in Objective C and later proved to be of wide use, and was applied with a vengeance in TOM.

The primary changes in TOM are the addition of multi-inheritance, "tuples" as a first-class part of the language, cleaner syntax, free of the C requirements for header files and pre-compiler commands, and the ability to use "categories" (the re-use mechanism) to include anything.

It is this latter ability that represents "the whole idea". Unlike Objective C's categories that allowed only new methods to be built onto existing classes, TOM allowed the addition of class and instance variables, new methods, even new superclasses. This results in the redefinition of "class" as "a class is defined by its main definition and any extensions", these extensions have become a first-class citizen of the language (similarly to Ruby).

The development of the TOM language has ceased.