Get startedGet started for free

Define mutable variables (var)

Scala has two kinds of variables: val and var. var are mutable and can be reassigned.

In Twenty-One, an ace is like a var, as it can be worth 1 or 11 points depending on the player's choice (as opposed to cards 2 through king, which have a constant point value throughout the game).

In this exercise, you will define each ace as a var of type Int set to a default value of 1 point. This time around, you'll leverage Scala's type inference (its ability to guess types based on supplied values) and omit the type annotation.

This exercise is part of the course

Introduction to Scala

View Course

Exercise instructions

  • Define four mutable variables, all of type Int and equal to 1: aceClubs, aceDiamonds, aceHearts, aceSpades.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

// Define mutable variables for all aces
Edit and Run Code