Array+Extension

Array+Extension.swift

import Foundation

public extension Array {
    
    subscript (safe index: Int) -> Element? {
        get {
            return index < count && index >= 0 ? self[index] : nil
        }
        set {
            if let element = newValue, index < count, index >= 0 {
                self[index] = element
            }
        }
    }
}

"0..<count ~= index" is shorter than "index < count && index >= 0"