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.
本练习是课程的一部分
Introduction to Scala
练习说明
- 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".
交互式实操练习
通过完成这段示例代码来试试这个练习。
// Define immutable variables for player names
___ playerA: ___ = ___
___ playerB: ___ = ___
___ playerC: ___ = ___
// Change playerC from Marta to Umberto
playerC = "Umberto"