Balloon Burst

Motivation

An exercise in reactive functional programming.

Demonstrates simple RFP pattern with practical implementation, and functional testing approach.

Specification

The purpose of balloon burst is to measure propensity to risk, in it you must inflate a balloon as many times as you dare and stop when you think it has been inflated as much as it will allow. If you manage to inflate a balloon and bank it you get the number of inflations added to your score, if you inflate the balloon beyond it's limit it will burst, and you don't get to bank anything.

First input is a list of balloon inflate limits eg: 10 2 4 6 9 2 with each number representing a balloon, and it's value the maximum number of inflations it can withstand,
Then an input of INFLATE will inflate the current balloon, an input of BANK will bank the current score and move on to the next balloon,
If the number of inflate attempts goes over that balloons burst limit a BURST must be printed to the user, input commands after that go to the next balloon,
Once there are no balloons left the final score is printed to the console.

Design

Basic RFP pattern is defined in a Program trait.

Main program logic is implemented as a pure function in a BalloonBurst object.

Command line program runner is presented in BalloonBurstCommandLine.

Tests

There are two kind of tests provided:

unit tests of program logic in BalloonBurstSpec
integration tests of program interaction simulation in BalloonBurstSimulationSpec

Run

sbt run

Example

$ sbt run
-> 2 4 1
-> INFLATE
-> INFLATE
-> INFLATE
<- BURST
-> INFLATE
-> BANK
-> INFLATE
-> BANK
<- SCORE: 2