hw_26_swift

//: Playground - noun: a place where people can play

import UIKit

// =============== 1 =====================

func changeItem<T>(_ array: [T]) -> [T] {
    guard !array.isEmpty else {
        print("\(array) -> Array is Empty!")
        return array
    }
    
    var changeArray: [T] = array
    
    let firstItem = changeArray[0]
    guard let lastItem = changeArray.last else { return array }
    changeArray[0] = lastItem
    changeArray[(changeArray.count - 1)] = firstItem

    print("\(array) --> \(changeArray)\n")
    
    return changeArray
}

let oldArray = [Any]()
let oldIntArray = [1, 2, 3, 4, 5]

print("\n=============== 1 =====================\n")
changeItem(oldArray)
changeItem(oldIntArray)

// =============== 2 =====================

func isSymmetric<T: Equatable>(_ array: [T]) -> Bool {
    let count = array.count
//    if count % 2 == 0 {
        let arrayLeft = array.dropLast(count / 2)
        let arrayRight = array.dropFirst(count / 2)
        let arrayTest = arrayRight.reversed()
        let answer = arrayLeft.elementsEqual(arrayTest)
        print("\(array) symmetric -is-> \(answer)\n")
        return answer
//    }
//    print("\(array) symmetric -is-> false")
//    return false
}

print("\n=============== 2 =====================\n")
isSymmetric(["a", "b", "4", "b", "a"])

//Дааа, Макс! заставил же ты меня .... ))))) а я протокол делаю, структуру....Equatable))))


// =============== 3 =====================

print("\n=============== 3 =====================\n")

class SortedArray<T: Comparable> {
    
    private var  arraySorted: [T] = []
    
    init(array: [T]) {
        arraySorted = array.sorted()
    }
    
    func append(_ item: T) {
        arraySorted.append(item)
        arraySorted.sort()
        print(arraySorted)
    }
    func removeLast(){
        arraySorted.removeLast()
        print(arraySorted)
    }
    func removeAtIndex(_ atIndex: Int){
        arraySorted.remove(at: atIndex)
        print(arraySorted)
    }
}

let newSortedArrayType = SortedArray(array: ["1", "b", "c", "2"])
newSortedArrayType.append("7")
newSortedArrayType.removeAtIndex(2)
newSortedArrayType.removeLast()