Objective-C

Brad Cox and Tom Love probably never imagined that their decision to hybridize the C language with Smalltalk concepts would give birth to one of the most enduring technologies in modern computing. Objective-C, created in 1983, would traverse the decades by constantly adapting.

The starting point was nevertheless simple. Dennis Ritchie and Ken Thompson had designed C in Bell Labs in the late 1960s to develop UNIX. This procedural language offered an interesting compromise between performance and readability, but its limitations became apparent in building complex systems. On the other side, at Xerox PARC, Alan Kay and Dan Ingalls were revolutionizing the programming approach with Smalltalk and its objects that encapsulated data and behaviors.

Cox and Love envisioned marrying these two worlds. Rather than creating a new language from scratch, they extended the existing C by grafting Smalltalk's object-oriented programming onto it. This pragmatic approach preserved the investment in C code while opening new possibilities for software design. The Free Software Foundation recognized the value of this innovation and integrated it into its toolbox.

Objective-C became a niche language appreciated by curious computer scientists. When Steve Jobs left Apple in 1985 to launch NeXT, he bet on Objective-C to develop NeXTSTEP. This technical choice transformed the language's destiny. NeXT pushed collaboration to the point of working with Sun Microsystems on OpenStep, a standardized version of their system. The Free Software Foundation followed suit with GNUstep.

Apple, bogged down in the 1990s, desperately sought to modernize Mac OS. After several failed attempts, two options presented themselves to the company: acquire Be, Inc. from Jean-Louis Gassée or buy back NeXT. The choice of NeXT in 1996 sealed Jobs's return and made Objective-C the technical heart of Mac OS X. A simple experimental language suddenly became the foundation of Apple's future.

The iPhone arrived in 2007. iOS, derived from Mac OS X, propelled Objective-C onto millions of mobile devices. The iPad three years later amplified the phenomenon even further. Developers worldwide discovered this hybrid language to create applications reaching hundreds of millions of users. This unexpected explosion revealed the robustness of the architecture imagined by Cox and Love twenty-five years earlier.

Faced with this massive adoption, Apple introduced substantial improvements, notably Automatic Reference Counting (ARC), which drastically simplified memory management. Gone were memory leaks and crashes related to lost pointers: ARC automated these tedious and error-prone tasks.

Objective-C's syntax bears the traces of this turbulent history. Traditional C coexists with Smalltalk's brackets in a cohabitation that surprises at first glance but reveals its coherence in use. The message system, inherited from Smalltalk, replaces direct method calls with a more flexible mechanism where objects communicate with each other. This approach enables dynamic method binding and facilitates system extension.

Frameworks accompany this syntactic richness. Foundation provides the basic building blocks: data manipulation, collections, file operations. These libraries form a coherent whole that accelerates development and standardizes practices. The id type perfectly illustrates the language's philosophy: it allows generic manipulation of objects while preserving type safety when necessary.

The ecosystem developed beyond Apple's borders. GNUstep maintains Objective-C's cross-platform portability, demonstrating that the concepts transcend the proprietary implementation. Xcode enriches the developer experience with Interface Builder and its visual tools. The community creates libraries, frameworks, and best practices that nurture a virtuous circle.

Swift arrived in 2014 as Apple's new champion. This announcement did not sound the death knell for Objective-C but testified to its maturity. Apple organized a gradual coexistence rather than an abrupt break, implicitly acknowledging the value of its historical language. The millions of lines of Objective-C code will continue to function for years.

Objective-C demonstrated that extending an existing language could succeed where creating from scratch often fails. Its message model inspired numerous object-oriented frameworks. Its ability to mix procedural and object paradigms opened paths explored by other languages.

Forty years after its birth, Objective-C remains a lesson in pragmatic engineering. Cox and Love knew how to identify the strengths of two different worlds and intelligently merge them. Their creation survived trends, acquisitions, mobile devices, and continues to power applications used daily by hundreds of millions of people. This longevity testifies to a solid design that knew how to adapt without losing its identity.