deathlezz

//
//  Compare elements in one array
//
  
//  Check if all elements in array are the same

let input = "aaaa"

let areSame = input.allSatisfy { $0 == input.last }

deathlezz

//
//  Restrict certain characters
//
//  Make certain characters impossible to use
//

import Foundation

let input = "abcd@e"

deathlezz

//
//  Remove certain characters
//

let input = "1 234 567".filter {!$0.isWhitespace}

let input2 = "aAbBcCdD".filter {!$0.isLowercase}

let input3 = "!@A#$BC%DE^FG&HI".filter {!$0.isLetter}

deathlezz

//
// Convert Int array to String array and vice versa
//

// Int array -> String array

let intArray = [1, 2, 3, 4, 5]

let stringArray = intArray.map { String($0) }

deathlezz

//
// Convert String array into String and vice versa
//
// Also convert Int array into Int and vice versa
//

import Foundation

// String array -> String
let stringArray = ["Kevin", "Bob", "Steve"]

deathlezz

//
// Find random element in array
//

let array = "abcdefghijklmnopqrstuvwxyz"

let random = (0...3).compactMap { _ in array.randomElement() }      // (0...3) - it means amount of characters

print(random)     // ["f", "u", "y", "m"]

deathlezz

//
// Rounding numbers
//

import Foundation

let number = 15.4444444445

let round = String(format: "%.2f", number)     // 2f stands for two decimal places

deathlezz

//
// Error handling
//

// Create error
enum InputError: Error {
    case EmptyName
}

// Create function

deathlezz

//
// Check the current date
//

import Foundation

// Create current date
var currentDate = Date()

// Create a DateFormatter object

deathlezz

//
//  Regular Expression (regex)
//
//  Check validation by regex
//

import Foundation

// Date
let date = "27-07-1999 10:41:12"