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Objective-C

Objective-C

Objective-C is a combination of C-like syntax with Smalltalk-like messaging. Unlike C, Objective-C includes an (optional) garbage collector. It is best known for being the standard programming language for macOS and iOS, until the introduction of Swift in 2014.

Master Objective-C with
Interactive Learning

Elevate your Objective-C skills through 51 curated exercises across 0 core concepts. Master problem-solving with a structured learning path designed for modern developers.

Objective-C

About Objective-C

Objective-C is a thin layer on top of C, and is a "strict superset" of C, meaning that it is possible to compile any C program with an Objective-C compiler, and to freely include C language code within an Objective-C class. Objective-C derives its object syntax from Smalltalk. All of the syntax for non-object-oriented operations (including primitive variables, pre-processing, expressions, function declarations, and function calls) is identical to that of C, while the syntax for object-oriented features is an implementation of Smalltalk-style messaging.

You can find more information about the language and its history here.

Key Features of Objective-C

Auto Memory Management

Automatic Reference Counting (ARC) allows memory to be managed automatically.

Dynamically Typed

Flexible and easy to use.

Interop

Objective-C can work with C, C++, and Swift.

Build Apple Apps

Use all Apple frameworks and libraries to develop apps for Apple's platforms.

Object-oriented

Objective-C is an object-oriented language, inspired by Smalltalk.

Categories

Allows the addition of methods to a class without subclassing or changing the actual class.

Track icon

Auto Memory Management

Automatic Reference Counting (ARC) allows memory to be managed automatically.

Dynamically Typed

Flexible and easy to use.

Interop

Objective-C can work with C, C++, and Swift.

Build Apple Apps

Use all Apple frameworks and libraries to develop apps for Apple's platforms.

Object-oriented

Objective-C is an object-oriented language, inspired by Smalltalk.

Categories

Allows the addition of methods to a class without subclassing or changing the actual class.

Dive into Objective-C practice challenges

Bob
Bob
Level 1

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Difference of Squares
Difference of Squares
Level 1

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

Gigasecond
Gigasecond
Level 1

Given a moment, determine the moment that would be after a gigasecond has passed.

Hello World
Hello World
Level 1

SlaveCode's classic introductory exercise. Just say "Hello, World!".

Leap
Leap
Level 1

Determine whether a given year is a leap year.

Reverse String
Reverse String
Level 1

Reverse a given string.