iOS Missions

iOS Swift Missions.swift

//1
func distance(ax : Int, ay : Int, bx :Int, by :Int)-> Float {
    
    let a = pow(Float(bx-ax), 2)
    let b = pow(Float(by-ay), 2)
    let sol2 : Float = a + b
    return sol2.squareRoot()
    
}
print(distance(ax: 1, ay: 1, bx: 5, by: 6))
//print 6.40312


//2
typealias Point = (a : Double, b : Double)

func distance2(a : Point, b : Point) -> Double {
    let x = pow(Double(b.a-a.a), 2)
    let y = pow(Double(b.b-a.b), 2)
    
    let sol2 : Double = x + y
    return sol2.squareRoot()
    
}
distance2(a: (1,1), b: (5,6))
//print 6.403124237432849..


//3
func age(from: String ) -> Int{
    
    
    let index = from.index(from.startIndex, offsetBy: 4)
    let sol = from.substring(to : index)
    let integerYear : Int = Int(sol)!
    let sol2 = 11707 - integerYear
    return sol2/100
    
}
print( age(from: "881201"))
//print 28.



//4
let arr: [Int?] = [1,4,-1,3,2]
var index : Int = 0
func enumerateList(A:[Int?]){
    while true{
        if arr[index] == -1{
            print("-1")
            break
        }
        print(arr[index]!,terminator: " -> ")
        index = arr[index]!
    }
}
func countOfList( A: [Int?])->Int{
    return arr.count
    
}
func isFullList(A : [Int?]) -> Bool{
    for index in arr{
        if index == nil{
            return false
        }
        else {
            return true
        }
    }
    return true
    
    
}

countOfList(A: arr)
isFullList(A: arr)
enumerateList(A: arr)
//print 5
//print true
//print 1 -> 4 -> 2 -> -1



//5
func complex(from array:[Int]) -> Int{
    let filtered = array.filter { index in index%2==0 || index%3==0 }.map{ $0 * 5 }.reduce(0, { $0 + $1})
    return filtered
}
complex(from : [1,2,3,4,5,6])
//prints 75