hashmap in Ruby code example

Example 1: ruby map hash

hash = { bacon: "protein", apple: "fruit" }

hash.map { |k,v| [k, v.to_sym] }.to_h
# {:bacon=>:protein, :apple=>:fruit}

Example 2: ruby assign value to hash

grades = Hash.new
grades["Dorothy Doe"] = 9

Example 3: how to access hash value ruby

my_hash["key"] #=> "value"