learn-co-students / kwk-l1-nested-data-structures-mini-lab-kwk-students-l1-stl-061818

Nesting Habits

Arrays inside of arrays! Hashes inside of hashes! Arrays inside of hashes! Hashes inside of arrays inside of hashes! Oh my!

1: Arrays in Arrays

ingredients = [
  ["rye", "sourdough", "baguette"],
  ["ham", "salami", "turkey"],
  ["swiss", "munster", "cheddar"],
  ["mayo", "mustard", "tabasco"]
]

The ingredients array above is a series of nested arrays. What do I get if I ask for:

• ingredients[0][1]
• ingredients[1]
• ingredients[1][0][0]

What code should I write to return each of these?:

• ["mayo", "mustard", "tabasco"]
• "cheddar"
• "sourdough"

DELIVERABLE: in index.rb implement the sandwich_request method, which takes in the ingredients array and an order array which is populated with ingredient strings. If the ingredients in the order are found within the ingredients array, the method returns true, otherwise it returns false, i.e.:

sandwich_request(ingredients, ["rye", "tofu", "cheddar"])
# => false (tofu could not be found!)

Note: the method should be able to handle an ingredients array with more, and fewer, ingredients in varying orders. To pass the test, you won't be able to hard code the method to work only with the example array above!

2: Hashes in Hashes

cities = {
  :new_york => { 
    :mayor => "Bill DeBlasio",
    :population => 8337000,
    :website => "http://www.nyc.gov"
  },
  :los_angeles => { 
    :mayor => "Eric Garcetti",
    :population => 3884307,
    :website => "http://www.lacity.org"
  },
  :miami => { 
    :mayor => "Tomás Regalado",
    :population => 419777,
    :website => "http://www.miamigov.com"
  },
  :chicago => { 
    :mayor => "Rahm Emanuel",
    :population => 2695598,
    :website => "http://www.cityofchicago.org/"
  }
}

The cities hash above is a series of nested hashes. What do I get returned if I ask for:

• cities[:los_angeles]
• cities[:chicago][:mayor]

What code should I write to return each of these?:

• The population of New York
• The website for Miami city government
• The mayor of Los Angeles
• A hash with all information on Chicago

Bonus: Use an each loop with another each loop to puts a string for each key value pair belonging to a city. For example, for Miami you should see:

"The mayor of miami is Tomás Regalado"
"The population of miami is 419777"
"The website of miami is http://www.miamigov.com"

DELIVERABLE: implement the city_populations method, which takes in the a cities hash and returns single number that is the sum of all the cities populations.

Note: the method should be able to handle a cities hash with more, and fewer, cities within. To pass the test, you won't be able to hard code the method to work only with the example hash above!

KWK-L1 Nesting Habits