Objective-C
Objective-C
About Objective-CPractice

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Join Exercism’s Objective-C Track for access to 51 exercises with automatic analysis of your code and personal mentoring, all 100% free.

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About Objective-C

@interface HelloWorld : NSObject
- (NSString *)hello:(NSString *)name;
@end

@implementation HelloWorld
- (NSString *)hello:(NSString *)name {
  if (!name) { name = @"World"; }
  return [NSString stringWithFormat:@"Hello, %@!", name];
}
@end

51 coding exercises for Objective-C on Exercism. From Strain to Allergies.

Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.

Strain

Strain

Implement the `keep` and `discard` operation on collections. Given a collection and a predicate on the collection's elements, `keep` returns a new collection containing those elements where the predicate is true, while `discard` returns a new collection containing those elements where the predicate is false.

Roman Numerals

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Allergies

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

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Key Features of Objective-C

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.

Get mentored the Objective-C way

Every language has its own way of doing things. Objective-C is no different. Our mentors will help you learn to think like a Objective-C developer and how to write idiomatic code in Objective-C. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in Objective-C - they'll help you discover the things you don't know that you don't know.

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Community-sourced Objective-C exercises

The Objective-C track on Exercism has 51 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.

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Objective-C

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