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Moviegoer

Welcome to Moviegoer on Exercism's Ruby Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

The ternary operator

A ternary conditional is a shorter way of writing simple if/else statements. If an if/else statement contains only two branches, one for when the condition is true and one for when it is false, it can be re-written as a ternary conditional.

Ternaries use a combination of the ? and : symbols to split up a conditional:

condition ? true_branch : false_branch

The code on the left side of the ? is the condition and the code on the right contains the two possible branches, separated by the :. If the condition is true, the code on the left side of the : is executed. If the condition is false, then the code on the right of the : gets executed.

For example:

if traffic_light == 'green'
  cross_the_road
else
  wait
end

can be re-written as:

traffic_light == 'green' ? cross_the_road : wait

Instructions

In this exercise you will build out rules for a movie theater's website.

1. Check if a moviegoer is entitled to the seniors' discount

The theatre offers a discount for "old-age-pensions". Anyone who is 60 or older pays 10.00 for a ticket. Anyone younger pays the full 15.00.

Write the Moviegoer#ticket_price method using a ternary statement.

Moviegoer.new(21).ticket_price
#=> 15

Moviegoer.new(65).ticket_price
#=> 10

2. Check if a moviegoer is allowed to see scary movies

The cinema has a simplified age-verification system. If you are 18 or over you can watch scary movies. If you are younger, you cannot.

Implement the Moviegoer.watch_scary_movie? method. It should return whether someone is allowed to watch the movie or not.

Moviegoer.new(21).watch_scary_movie?
#=> true

Moviegoer.new(17).watch_scary_movie?
#=> false

3. Check if a moviegoer is entitled to free popcorn

The cinema has a Movie Club program. Members get free popcorn when they watch any movie.

Implement the Moviegoer.claim_free_popcorn! method. If a viewer is a movie club member, they should be rewarded with their free popcorn. If they are not, the method should raise the NotMovieClubMemberError exception defined at the top of the code.

Moviegoer.new(21, member: true).claim_free_popcorn!
#=> 🍿

Moviegoer.new(17, member: false).claim_free_popcorn!
#=> Exception was raised! (NotMovieClubMemberError)

Source

Created by

  • @lxmrc
  • @iHiD

My Solution