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.

本练习是课程的一部分

Introduction to Scala

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练习说明

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.

交互式实操练习

通过完成这段示例代码来试试这个练习。

// 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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