Nested Collections
Nested Collections
WarmUp
animals = {"dogs" => 3, "cats" => 5, "iguanas" => 2}
pet_names = ["Fela", "Spot", "Patch", "Willy"]
- return the count of dogs
- add 3 parakeets
- increase the amount of cats by 2
- add “Claude” to the
pet_names
- access which name is first in the list of
pet_names
- remove “Fela” from the list of
pet_names
Nested Arrays
numbers = [[1, 2, 3], [4, 5, 6]]
- what is
numbers.count
- what is
numbers.first.count
- how can I access the element
5
- how can I add
[7,8,9]
to the numbers array
Hashes within an Array
food_feelings = [{:pizza => "tasty"}, {:calzone => "also tasty"}]
- what is
food_feelings.count
- what is
food_feelings.first.count
- how can I access the element
"also tasty"
- how can I change
also tasty
tosuper delicious
Hash within a Hash
pets = {:dog => {:name => "Chance", :weight => "45 pounds"},
:cat => {:name => "Sassy", :weight => "15 pounds"}}
- what is
pets.count
- what is
pets.keys
- what is
pets.values
- how can I access the element
"15 pounds"
- how can I add
:age => 3
to the value of the key:dog
Array within a Hash
pizza_toppings = {veggies: ["green peppers", "jalapeño", "mushrooms"],
protein: ["pepperoni", "sausage", "sardines"],
fruit: ["pineapple"]}
- What is
pizza_toppings.count
- What is
pizza_toppings.values
- How can I access the element
"pineapple"
- How can I add the element
"olives"
to they key"veggies"
Pair Practice with Hashes and Nesting
See lesson plan.