ITP - hashes - interating over hash

Because hashes can have multiple elements in them, there will be times
when you'll want to iterate over a hash to do something with each
element. Iterating over hashes is similar to iterating over arrays with
some small differences. We'll use the each method again and this time
we'll create a new file to test this out.

person = {name: 'bob', height: '6 ft', weight: '160 lbs', hair: 'brown'}

person.each do |key, value|
  puts "Bob's #{key} is #{value}"
end

We use the each method like before, but this time we assign a variable
to both the key and the value. In this example we are setting the key to
the key variable and the value to the value variable.