create an array extension in swift

To create an extension for the Array type in Swift, follow these steps:

1. Declare the extension using the extension keyword, followed by the name of the type you want to extend (Array in this case).

2. Define the new functionality or additional computed properties you want to add to the Array type.

3. Here's an example of creating an extension for the Array type in Swift that adds a method to return the sum of all integers in the array:

main.swift
extension Array where Element == Int {
    func sum() -> Int {
        var result = 0
        for number in self {
            result += number
        }
        return result
    }
}
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In this example, we are extending the Array type with a method named sum. This extension is constrained to arrays of type Int (using the where clause).

You can use this extension like this:

main.swift
let numbers = [1, 2, 3, 4, 5]
let totalSum = numbers.sum() // totalSum will be 15
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By extending the Array type in Swift, you can add custom functionality to suit your specific needs.