/my-first-hash-prework

Primary LanguageRubyOtherNOASSERTION

My First Hash

Objectives

  1. Create hashes using the literal constructor.
  2. Retrieve data from hashes using the bracket method.
  3. Add data to hashes using the "bracket-equals" method.

Instructions

Challenge I: Instantiating Hashes

  • In the my_hash method, use the literal constructor to set a variable called my_hash equal to a hash with key/value pairs of your choice.

  • Remember, key/value pairs are associative. It doesn't make sense to have a key/value pair of "my_name" => 78. It does make sense to have a key/value pair of "my_name" => "Herman Melville" (if you happen to be that author, of course).

Challenge II: Hash with Data

  • In the shipping_manifest method, set a variable called shipping_manifest equal to a hash.
  • Fill that hash with key/value pairs that describe the following information:
    • We have 5 whale bone corsets, 2 porcelain vases and 3 oil paintings. Your hash should have the following key/value pairs:
      • "whale bone corsets" => 5
      • "porcelain vases" => 2
      • "oil paintings" => 3
  • Note: Build this hash yourself! Don't just copy and paste from the following methods. :)

Challenge III: Retrieving Data

  • In the retrieval method we've given you the shipping_manifest hash that you built out in the previous challenge. Use the [] hash method to return the value of the "oil paintings" key of the shipping_manifest hash.
  • For example, if we have the following hash:
hash = {"key1" => "value1"}

We can return the value of "key1" like this:

hash["key1"]

Challenge IV: Adding Data

  • In the adding method, we've once again given you the shipping_manifest hash. Use the []= method to add the following key/value pair to the hash:
    • "pearl necklace" => 1
    • This method must return the newly-added-to shipping_manifest.
    • Remember that the return value of using the []= method is the value of the key/value pair you added. We need our adding method to return the shipping_manifest.
    • Here's a refresher on the []= method:
hash = {"key1" => "value1"}
hash["key2"] = "value2"
# returns "value2"

puts hash
# > {"key1" => "value1", "key2" => "value2"}

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