[Ruby] Implement new Concept Exercise: booleans

[biancapower]

This issue describes how to implement the booleans concept exercise for the Ruby track.

Getting started

Please please please read the docs before starting. Posting PRs without reading these docs will be a lot more frustrating for you during the review cycle, and exhaust Exercism's maintainers' time. So, before diving into the implementation, please read up on the following documents:

• The features of v3.
• Rationale for v3.
• What are concept exercise and how they are structured?

Please also watch the following video:

• The Anatomy of a Concept Exercise.

Goal

The goal of this exercise is to teach the student the Concept of Booleans in Ruby.

Learning objectives

• Know how to use ternary expressions - using the ?: operator.

Out of scope

N/A

Concepts

• Booleans
  • know the two Boolean values
  • know the "boolean" nature of Ruby methods
• Conditional statements
  • know the difference in precedence between and and &&, or and ||
• know about operators that are used with conditional statements
• know how to build logical expressions with boolean operators

Prerequisites

• basics

Resources to refer to

Hints

• Booleans Ruby

After

• Why Ruby doesn't have a Boolean Class
• Understanding Boolean Values in Ruby

Representer

This exercise does not require any specific representation logic to be added to the representer.

Analyzer

This exercise does not require any specific analyzer logic to be added to the analyzer.

Implementing

To implement this exercise, please follow these instructions.

Help

If you have any questions while implementing the exercise, please post the questions as comments in this issue.

[biancapower]

Assigned myself to implement this.

[dvik1950]

I opened a similar Issue a while ago but haven't been able to complete it: #1624 . I haven't done much work regarding the exercise so no double effort has been made but I think it makes sense to look at the existing issues to see if a similar one already exists. I also see that @neenjaw has implemented this and made a pull request yesterday #2025. I might be completely wrong here because I'm a bit out of the loop but I think this should be sorted out so no double effort is made :)

[neenjaw]

Ya it's been a bit of a ride to go through several nil exercises to what there is now in #2023 followed by #2025. I've been meaning to tag this issue with those events.

[neenjaw]

Also the already committed numbers exercise touches on booleans a little, so there is need for some reconfiguration of the track. as iHiD pointed out

[neenjaw]

Is this complete then? Should be closed?