AhmedMenaim

import UIKit

/// MissingHashMarkAsPrefix:   "Invalid RGB string, missing '#' as prefix"
/// UnableToScanHexValue:      "Scan hex error"
/// MismatchedHexStringLength: "Invalid RGB string, number of characters after '#' should be either 3, 4, 6 or 8"
public enum UIColorInputError: Error {
  case missingHashMarkAsPrefix
  case unableToScanHexValue
  case mismatchedHexStringLength
  case outputHexStringForWideDisplayColor

AhmedMenaim

import Foundation

// MARK: - What are the Loops

// arr = [1,2,3,4,5] -> print(arr[0]), print(arr[1]

// MARK: - For-In Loops

 let names = ["Ahmed", "Mohamed", "Menaim", "Mahmoud"]
for name in names { // name is a container

AhmedMenaim

import Foundation

// MARK: - What is the dictionary !?

// [Key -> Unique : Value] => Key is int , Value is String, Unsorted (Unarranged)

// MARK: - Creating a Dictionary

var dict: [Int : String] = [:]
var newDict = [12893483 : "Ahmed Menaim", 13713621: "Menaim"]

AhmedMenaim

import Foundation

// MARK: - What is the Set !?

// Unarranged list , perform operations,

// MARK: - Create Set
var letters = Set<Character>()

var names: Set<String> = ["ahmed", "mohamed", "Fawzy", "Menaim"]

AhmedMenaim

import Foundation


// MARK: - What is the array !?
 // -> [] -> Arranged -> [1,2,3,4] var a = 1, var b = 2 var array = []

// MARK: - Create Array

//var stringsArray = [] // -> Will give us an error

AhmedMenaim

import Foundation

// MARK: - Comparison Operators < > == != >= <=

let number = 8

if number >= 5 { // if number = 5 or number > 5
    print(number)
}

AhmedMenaim

import Foundation


let number = 5

switch number { // if number
case 5: // number == 5
    print("Done")
case 6: // else if number == 6
    print("\(number) is done")

AhmedMenaim

import UIKit

var greeting = "Hello, playground"

let number = 6

if number == 5 { // equal comparison
    print ("Number is correct")
}
else if number == 6 {

AhmedMenaim

import Foundation

// MARK: - Assignment Operator =
var a = 15
var b = 5

// MARK: - Arithmetic Operators + - * /
print(a+b)
print(a-b)
print(a*b)

AhmedMenaim

import Foundation



var stringNumber: String? // We can identify any optional variable using -> ?

var number = 5

//print(Int(stringNumber!)! + number) // Force unwrapping -> ! = Make sure that I have a value here