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Exercise 3

Write a program that uses a hash to store a list of movie titles with the year they came out. Then use the puts command to make your program print out the year of each movie to the screen. The output for your program should look something like this.

Solution

movies = { :jaws => 1975,
           :anchorman => 2004,
           :man_of_steel => 2013,
           :a_beautiful_mind => 2001,
           :the_evil_dead => 1981 }

puts movies[:jaws]
puts movies[:anchorman]
puts movies[:man_of_steel]
puts movies[:a_beautiful_mind]
puts movies[:the_evil_dead]

We also show a solution that uses the new syntax for creating hashes (as of Ruby 1.9):

movies = { jaws: 1975,
           anchorman: 2004,
           man_of_steel: 2013,
           a_beautiful_mind: 2001,
           the_evil_dead: 1981 }

puts movies[:jaws]
puts movies[:anchorman]
puts movies[:man_of_steel]
puts movies[:a_beautiful_mind]
puts movies[:the_evil_dead]

This syntax only works when using symbols (e.g., :jaws) as a key. We'll cover it in more detail later.

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