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  3. Introduction to Scala

Exercise

Don't try to change me

Imagine a three-player game of Twenty-One with your friends Alex, Chen, and Marta. Then imagine Marta dropping out of the game and your friend Umberto joining in her place. Note that player names are of type String, which is a sequence of Char in Scala. String is also commonly used in data-related tasks.

In this exercise, you will define immutable variables (val) then try to reassign them. You will encounter an error. Seeing this error message in a controlled setting will help you interpret this message and similar ones when you're coding on your own in the future.

Instructions

100 XP
  • Define playerA, playerB, and playerC as immutable variables with the strings "Alex", "Chen", and "Marta", respectively.
  • Read the code that reassigns playerC to "Umberto". Click "Run Code" and observe the error.
  • Delete the code that reassigns playerC to "Umberto".
  • Change the original playerC variable definition from "Marta" to "Umberto".