Day13(Summary1).md

👨🏻‍💻 Day 13

📖 Summary - 1

• Variables and Constants
• Types of Data
• Operators
• String Interpolation
• Arrays
• Dictionaries
• Conditional Statements
• Loops
• Switch Case

Variables and Constants

var name = "Ahmet Tunahan"  
// Variables 
// - Changeable
// - Fast  
// - Unique Name

let age = 22
// Constants
// - Not Changeable
// - More Fast
// - Unique Name

Types of Data

var name : String
name = "Tunahan"

var age : Int
number = 22

var dAge : Double
dNumber = 22.0

var fAge : Float
fNumber = 22.0

var is : Bool
is = true

⚙️ Double vs Float

Actually, these are very similar Swift types. But... Apple recommends that we use Double.
Because it has more accurate results in larger numbers.

Usage Tips

Swift can automatically assign value types and protect them.
However, it is recommended that you determine the types yourself.

var fAge = 22.0 // Float

var dAge : Double = 22.0 // Double

Operators

Basic

var number : Int = 22
number = number + 1 // 23
number = number - 1 // 21
number = number * 2 // 44
number = number / 2 // 11

var number : Int = 22
number += 1 // 23
number -= 1 // 21
number *= 2 // 44
number /= 2 // 11

var number : Double = 22.0
var number2 : Double = 22.0

var result = number + number2 // 44.0

var name = "Tunahan"
var surname = "Bekdaş"

var fullName = name + " " + surname // Tunahan Bekdaş

Comparison

var num : Int = 22
var num2 : Int = 23

var result : Bool

result = num > num2 // false
result = num < num2 // true
result = num >= num2 // false
result = num <= num2 // true

var name : String = "Tunahan"
var result : Bool 
result = (name == "Tunahan") // true

var result = false
result // false
!result // true

var num : Int = 12
var result : Bool
result = (num == 12) // Equal -> true
result = (num != 12) // Not Equal -> false

String Interpolation

let age = "Tunahan"
let text = "My name is \(name)"

let fNumber : Float = 12.0
let text = "This number : \(fNumber) is float"

let age : Int = 22
let text = "I'm \(age) years old."

Arrays

let numbers = [1, 2, 3, 4, 5]
let lettes = ["a", "b", "c", "d", "e"]

var first = numbers[3] // 4

let numbers : [Int] = [1, 2, 3, 4, 5]
let lettes : [String] = ["a", "b", "c", "d", "e"]
let shuffle : [Any] = [1 , "a" , true]

var array : [String] = []
var array2 = [String]()
var array3 = Array<String>()

Dictionaries

var me = [
    "name" : "Tunahan",
    "surname" : "Bekdaş",
    "job" : "Developer"
]
me["name"] // Tunahan

var me : [String : Any] = [
    "name" : "Tunahan" ,
    "surname" : "Bekedaş" ,
    "age" : 22 ,
    "hobbies" : ["chess","fitness"]
]

me["hobbies"] // ["chess","fitness"]

Conditional Statements

var youGood = true

if youGood {
  print("Learn more Learn")
}

var isMan = true
var isStudent = true

if isMan && isStudent {
  print("Check")
}else{
  print("None")
}

Loops

for x in 1...10{
    print("\(x) * 8 : \(i * 10)")
}

for _ in 1...10{
    print("Machina!")
}

var myArray = ["A", "B", "C", "D", "E", "F"]
for i in myArray {
    print(i)
}

let songs = ["wish i loved you in the 90s", "bad ones" , "you broke me first"]
for song in songs{
    if song != "wish i loved you in the 90s"{
      continue
    }
    print("My favorite song is \(song)")
}

Inner loops

for i in 0..<10{
    for j in (0..<10).reversed(){
        print("\(i) or \(j)")
    }
}

var people = ["A", "B", "C", "D", "E"]
var actions = ["good", "bad", "angry", "happy"]

for i in 0..<people.count {
    for z in 0..<actions.count {
        print("\(people[i]) is \(actions[z])")
    }
}

var result = 0
var total = 0

for i in 1...20 {
    for z in 20...30{
        print("\(i) x \(z) = \(i * z)")
        result = i * z
        
       total += result
        
        print(total)
    }
}

var song = ["A", "B", "C", "D", "E"]


for songs in song {
    if sons == "C"{
        continue
    }
    print("I love \(songs)")
}

While

var counter = 0
while true {
    print("Counter is now \(counter)")
    counter += 1

    if counter == 666 {
        break
    }
}

Switch Case

let playerHealth = 3

switch playerHealth {
case 1:
    print("You're on the brink of death")

case 2:
    print("Your health is at a medium level")

case 3:
    print("You are healthy")

default:
    print("You have died")
}

let userAge = 20

switch userAge {
case 0...18:
    print("You are kid")

case 19...40:
     print("You are adult")

case 41...90:
    print("You are old")

default:
    print("Probably you died")
}