vicxruiz

func numberOfVowels(in string: String) -> Int {
  var numberOfVowels: Int = 0
  for x in string {
    if x == "a" || x == "e" || x == "i" || x == "o" || x == "u" {
      numberOfVowels += 1
    }
  }
  return numberOfVowels
}

vicxruiz

extension String { 
    func anotherContains(string: String) -> Bool {
        if self.lowercased().range(of: string) != nil {
            return true
        } else if self.uppercased().range(of: string) != nil {
            return true
        }
        else {
            return false
        }

vicxruiz

extension Int {
    func expressNumber() -> [Int] {
        var result: [Int] = []
        let stringNum = String(self)
        var count = stringNum.count - 1
        for x in stringNum {
            var element = String(x)
            let str = String(repeating: "0", count: count)
            element += str
            result.append(Int(element) ?? 0)

vicxruiz

extension Array {
    func shuffleArray() {
        var shuffled: [Int] = []
        for i in 0..self.count {
            let rand = Int(arc4random_uniform(UInt32(self.count)))
        
        shuffled.appened(self[rand])
        shuffled.remove(at: rand)
        }
    }

vicxruiz

func doAsTheRomansDoAndNumeralize(elementInt: Int) -> String {
    var element = elementInt
    var romanNumeralString: String = ""
    
    if element >= 1000 {
        //divide element by 1000 till it's less than 1000
        let result = element / 1000
        if result >= 1 {
            element = element % 1000
            romanNumeralString += "M"

vicxruiz

func isTwinPrime(_ number: Int) -> Bool {
    
    if number > 1 && !(2..<number).contains { number % $0 == 0 } {
        let lowerDifference = number - 2
        let higherDifference = number + 2
        if lowerDifference > 1 && !(2..<lowerDifference).contains { lowerDifference % $0 == 0 } {
            return true
        }
        if higherDifference > 1 && !(2..<higherDifference).contains { higherDifference % $0 == 0 } {
            return true

vicxruiz

Given two arrays arr1 and arr2, the elements of arr2 are distinct, and all elements in arr2 are also in arr1.

Sort the elements of arr1 such that the relative ordering of items in arr1 are the same as in arr2.  
Elements that don't appear in arr2 should be placed at the end of arr1 in ascending order.

 

Example 1:

Input: arr1 = [2,3,1,3,2,4,6,7,9,2,19], arr2 = [2,1,4,3,9,6]

vicxruiz

Write a program that outputs the string representation of numbers from 1 to n.

But for multiples of three it should output “Fizz” instead of the number and for the multiples of five output “Buzz”. 
For numbers which are multiples of both three and five output “FizzBuzz”.

Example:

n = 15,

Return:

vicxruiz

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example 1:

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

vicxruiz

Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.

Find all the elements of [1, n] inclusive that do not appear in this array.

Example:

Input:
[4,3,2,7,8,2,3,1]

Output: