Foundation+PatchDay.swift

//
//  ArrayExtension.swift
//  PDKit
//
//  Created by Juliya Smith on 10/29/19.

import Foundation

public extension Array {

    func tryGet(at index: Index) -> Element? {
        guard index < count && index >= 0 else { return nil }
        return self[index]
    }
}

public extension Array where Element: Equatable {

    func tryGetIndex(item: Element?) -> Index? {
        guard let item = item else { return nil }
        return firstIndex(of: item)
    }
}

// https://stackoverflow.com/questions/39677330/how-does-string-substring-work-in-swift
public extension String {
    func index(from: Int) -> Index {
        self.index(startIndex, offsetBy: from)
    }

    func substring(from: Int) -> String {
        let fromIndex = index(from: from)
        return String(self[fromIndex...])
    }

    func substring(to: Int) -> String {
        let toIndex = index(from: to)
        return String(self[..<toIndex])
    }

    func substring(with r: Range<Int>) -> String {
        let startIndex = index(from: r.lowerBound)
        let endIndex = index(from: r.upperBound)
        return String(self[startIndex..<endIndex])
    }
}

public extension UIViewController {

    func getStyle() -> UIUserInterfaceStyle {
        self.traitCollection.userInterfaceStyle
    }
}