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Exercise 16

Challenge: In exercise 11, we manually set the contacts hash values one by one. Now, programmatically loop or iterate over the contacts hash from exercise 11, and populate the associated data from the contact_data array. Hint: you will probably need to iterate over ([:email, :address, :phone]), and some helpful methods might be the Array shift and first methods.

Note that this exercise is only concerned with dealing with 1 entry in the contacts hash, like this:

contact_data = ["joe@email.com", "123 Main st.", "555-123-4567"]
contacts = {"Joe Smith" => {}}

As a bonus, see if you can figure out how to make it work with multiple entries in the contacts hash.

Exercises marked as challenges can be very difficult. Don't get discouraged if you can't complete it, but do make the attempt. Even if you can't solve the exercise, be sure to read through the solution, if one is provided.

Solution

contact_data = ["joe@email.com", "123 Main st.", "555-123-4567"]
contacts = {"Joe Smith" => {}}
fields = [:email, :address, :phone]

contacts.each do |name, hash|
  fields.each do |field|
    hash[field] = contact_data.shift
  end
end

Solution to bonus, where we can work with multiple entries in the contacts hash:

contact_data = [["joe@email.com", "123 Main st.", "555-123-4567"],
            ["sally@email.com", "404 Not Found Dr.", "123-234-3454"]]
contacts = {"Joe Smith" => {}, "Sally Johnson" => {}}
fields = [:email, :address, :phone]

contacts.each_with_index do |(name, hash), idx|
  fields.each do |field|
    hash[field] = contact_data[idx].shift
  end
end

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