Beginning Objective-C

Chapter    2

Object-Oriented Programming

Object-oriented programming is not new; today it’s probably the most widely used programming paradigm on the planet. Its history goes back to the late 1950s and early 60s with the first use of classes and instances in the Simula 67 language. This concept was then expanded upon at Xerox PARC in the 1970s with the creation of the Smalltalk language, which introduced the term object-oriented programming to describe the pervasive use of objects and messages throughout the system; everything in Smalltalk was an object, even constant scalar values such as “62.” Objective-C was created in the 1980s as a means to merge the object-oriented approach (and some of the syntax) of Smalltalk with the imperative programming ...