What is the code used here to complete the challenge. Please explain why.

You need to use an if statement to check if the hash has the key calories and if it does assign food = true

if hash.has_key?("calories")
  food = true
end

grocery_item = { "item" => "Bread", "quantity" => 1, "brand" => "Treehouse Bread Company", "food" => true }
grocery_item.has_value?(true)

this is the first part: I used http://ruby-doc.org/core-2.2.2/Hash.html#method-i-has_value-3F

scroll down to where it says has_value? Use Command + f on a mac to search the website for it. after you press command + f a search bar should come up on the right side of the screen. this is a trick question, the bread is already there, all you need to do is add ,"food" => true at the end of the hash, and then use the has_value? method to check if true is inside the grocery_item hash. that was already created for you.

the second part as a whole is:

grocery_item = { "item" => "Bread", "quantity" => 1, "brand" => "Treehouse Bread Company", "food" => true }
grocery_list = grocery_item.values_at("item")
grocery_item.has_value?(true)

took me a while to figure out what they mean't! with a combination of that link and their video I figured it out, all you are doing is assigning .values_at to grocery_item then making grocery_list equal to grocery_item.values_at("item") I thought I had to make a separate array, which I did basically by doing the .value_at method, it just turned ("item") into its own array.