Converting while to foreach

Previously, you wrote a while loop in the imperative style to find and print the number of points to bust for five hands (one for each player) in a round of Twenty-One:

// Define counter variable
var i = 0

// Create list with five hands of Twenty-One
var hands = List(16, 21, 8, 25, 4)

// Loop through hands
while(i < hands.length) {
  // Find and print number of points to bust
  println(pointsToBust(hands(i)))
  // Increment the counter variable
  i += 1
}

In this exercise, you'll convert that code to a more functional, Scala-preferred style using the foreach method. The bust function is already defined for you. A modified pointsToBust function (with println) is provided in the sample code.

이 연습은 강의의 일부입니다

Introduction to Scala

강의 보기

연습 안내

Call the foreach method on the hands array of arrays, looping through each round to find the number of points to bust using the pointsToBust function.

실습형 인터랙티브 연습

이 예제를 이 샘플 코드를 완성하여 풀어보세요.

// Find the number of points that will cause a bust
def pointsToBust(hand: Int) = {
  // If the hand is a bust, 0 points remain
  if (bust(hand))
    println(0)
  // Otherwise, calculate the difference between 21 and the current hand
  else
    println(21 - hand)
}

// Create list with five hands of Twenty-One
var hands = List(16, 21, 8, 25, 4)

// Loop through hands, finding each hand's number of points to bust
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코드 편집 및 실행