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  3. Introduction to Scala

Exercise

Initialize and prepend to a list

The List in Scala is like the Array in that they are a sequence of objects that share the same type. The List collection, however, is immutable. When performing operations on lists, the result will be a new list with a new value. The cons operator (::) prepends an element to a list.

Imagine you wanted to raise the stakes a little when playing Twenty-One by adding a monetary prize for each round. The winner of round one gets $10, the winner of round two gets $15, etc.

In this exercise, you'll create a list to store these prize values for five rounds, then prepend to it to accommodate another round.

Instructions

100 XP
  • Initialize a list named prizes with an element for each round's prize, where the first through fifth round's prizes are 10, 15, 20, 25, and 30, respectively.
  • Prepend to prizes using the cons (::) operator so a new first round is added, worth $5. Name the new list newPrizes.