define a struct that conforms to collection in swift

To define a struct that conforms to the Collection protocol in Swift, we need to follow these steps:

Define a struct that has a generic type parameter, which represents the type of values that will be stored in the collection.


main.swift
struct MyCollection<T>: Collection {
   // implementation goes here
}
70 chars
4 lines

Make the struct conform to the Collection protocol by implementing the following required properties:


main.swift
// Define the index type for the collection
typealias Index = Int

// Define the start index of the collection
var startIndex: Index { get }

// Define the end index of the collection
var endIndex: Index { get }

// Return the element at the given index
subscript(position: Index) -> T { get }
294 chars
12 lines

Optionally implement other methods and properties required by the Collection protocol. For example, we can implement the index(after:) method that returns the index immediately after the given index.


main.swift
// Returns the index immediately after the given index
func index(after i: Index) -> Index {
    return i + 1
}
112 chars
5 lines

Here's an example implementation of a custom collection struct that conforms to the Collection protocol:


main.swift
struct MyCollection<T>: Collection {
    var items: [T]

    var startIndex: Int {
        return items.startIndex
    }

    var endIndex: Int {
        return items.endIndex
    }

    func index(after i: Int) -> Int {
        return items.index(after: i)
    }

    subscript(position: Int) -> T {
        return items[position]
    }
}
340 chars
20 lines

With this implementation, we can use all the methods and properties available on collections in Swift, such as iterating using a for-in loop, getting the count of elements, accessing elements by index, and more.

similar swift code snippets

define a collection struct in swift

create a generic struct in swift

a struct called book with the relevant properties in swift

define a struct depicting a car, with a brand, model and year properties, as well as a beep function that prints “beep” into the console in swift

create codeable struct in swift

how to create a struct in swift

sort a list of people by name in swift

how do you determine if a string is a palindrome in swift

hello world in swift

protocol in swift

related categories