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shfastenumerationprotocols



Introduction

Welcome to the documentation for the shfastenumerationprotocols library. This library provides a set of protocols that extend the functionality of fast enumeration in Objective-C. It is designed to simplify and enhance common operations performed with fast enumeration, making your code more concise and expressive.

Installation

To use the shfastenumerationprotocols library in your project, follow the steps below:

  1. Open your Xcode project.
  2. Go to the project settings.
  3. Select your target.
  4. Go to the “General” tab.
  5. Scroll down to the “Frameworks, Libraries, and Embedded Content” section.
  6. Click the “+” button.
  7. Search for “shfastenumerationprotocols”.
  8. Select the library and click “Add”.

Usage

Protocol 1: SHEnumerable

The SHEnumerable protocol defines a set of methods that can be used to perform operations on a collection in a concise and efficient manner.

Methods

  • - each: Executes a provided block for each element in the collection.
  • - filter: Returns a new collection containing only the elements that satisfy the provided condition.
  • - map: Returns a new collection with the results of applying a provided block to each element.

Protocol 2: SHFastEnumeration

The SHFastEnumeration protocol provides a way to iterate over a collection using fast enumeration, with additional features.

Methods

  • - reversed: Returns a new collection that iterates over the elements in reverse order.
  • - shuffled: Returns a new collection with the elements in a random order.
  • - reduced: Returns a single value by applying a provided block to all elements and accumulating the result.

Examples

Example 1: Using SHEnumerable

Let’s say we have an array of numbers and we want to calculate the sum of all even numbers using the SHEnumerable protocol.


[array filter:^(NSNumber *num) {
return num.intValue % 2 == 0;
}]
.reduce(0, ^NSInteger(NSInteger result, NSNumber *num) {
return result + num.integerValue;
});

Example 2: Using SHFastEnumeration

Now let’s see how we can reverse an array using the SHFastEnumeration protocol.


[array reversed];

Conclusion

The shfastenumerationprotocols library provides a convenient set of protocols for enhancing the functionality of fast enumeration in Objective-C. By using these protocols, you can make your code more concise and expressive, improving the efficiency of collection operations. Enjoy using shfastenumerationprotocols in your projects!