[Ruby] Hash Methods _ #.length#.has_key?(k)#.has_value?(v)#.keys#.values

dog = {
  "name" => "Fido",
  "color" => "black",
  "age" => 3,
  "isHungry" => "true",
  "enemies" => ["squirrel"],
}

dog["location"] = "NY"
dog["age"] += 10
dog["enemies"] << "mailman" 

puts dog
------------------------------
#=>
{"name"=>"Fido", "color"=>"black", "age"=>13, "isHungry"=>"true", "enemies"=>["squirrel", "mailman"], "location"=>"NY"}

dog = {
  "name" => "Fido",
  "color" => "black",
  "age" => 3,
  "isHungry" => "true",
  "enemies" => ["squirrel"],
}

puts dog.has_key?("color")
puts dog.has_key?("location")
puts dog.has_key?("Color")

puts dog.has_value?(false) 
puts dog.has_value?(3) 

p dog.keys[1]
p dog.values
-------------------------------
#=>
true
false
false
false
true

color
["Fido", "black", 3, "true", ["squirrel"]]