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.
この演習はコースの一部です
Introduction to Scala
演習の手順
- Define
playerA,playerB, andplayerCas immutable variables with the strings "Alex", "Chen", and "Marta", respectively. - Read the code that reassigns
playerCto "Umberto". Click "Run Code" and observe the error. - Delete the code that reassigns
playerCto "Umberto". - Change the original
playerCvariable definition from "Marta" to "Umberto".
実践的なインタラクティブ演習
このサンプルコードを完成させて、この演習に挑戦してみましょう。
// Define immutable variables for player names
___ playerA: ___ = ___
___ playerB: ___ = ___
___ playerC: ___ = ___
// Change playerC from Marta to Umberto
playerC = "Umberto"