ruby how to create a hash code example

Example 1: how to make a new hash ruby

my_hash = Hash.new #=> { }
# OR
my_hash = {}

Example 2: how to access hash value ruby

my_hash.values_at("key1", "key2") #=> ["value1", "value2"]

Example 3: ruby assign value to hash

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