Basic conversions in Swift3 (String, Int, Array, Data)

Conversion.swift

//Conversion

import UIKit



//String To Int | "123" -> 123

var str = "123"
var int = 0

int = Int(str)!



//String to Int | "456" -> 456

let str2 = "456"
var int2 = 0

int2 = (str2 as NSString).integerValue



//Int to String | 123 -> "123"

str = String(int)



//String to [Int] | "789" -> [7,8,9]

let str3 = "789"
let int3 = 0
var intArray2 : [Int] = []

intArray2 = str3.characters.flatMap{Int(String($0))}



//[Int] to String | [7,8,9] -> "789"
var newString = ""
var singleInt : Int
    
    
for number in intArray2{
    newString += String(number)
}

print(newString)



//ARRAY CONVERT

var stringArray : [String] = ["7","8","9"]
var intArray : [Int] = [1,2,3,4,5]

//Empthy Arrays
var iArray : [Int] = [Int]()
var sArray : [String] = [String]()

//[Int] to [String] | [1,2,3,4,5] -> ["1","2","3","4","5"]

sArray = intArray.map{String($0)}

//[String] to [Int] | ["7","8","9"] -> [7,8,9]

iArray = stringArray.map{String($0)}

//[String] to [Int] | ["7","8","9"] -> [7,8,9]
var intInArray : Int
var i : Int = 0
for char in stringArray{
    intInArray = Int(char)!
    iArray.insert(intInArray, at:i )
    i += 1
}