planets = {
"Mars" => 1,
"Jupyter" => 2,
"Saturn" => 3,
"Earth" => 4,
}
puts planets
puts planets.merge({"Venus" => 5, "Mars" => 10})
puts planets
puts planets.merge!({"Pluto" => 5, "Mars" => 20})
puts planets
{"Mars" => 1, "Jupyter" => 2, "Saturn" => 3, "Earth" => 4}
{"Mars" => 10, "Jupyter" => 2, "Saturn" => 3, "Earth" => 4, "Venus" => 5}
{"Mars" => 1, "Jupyter" => 2, "Saturn" => 3, "Earth" => 4}
{"Mars" => 20, "Jupyter" => 2, "Saturn" => 3, "Earth" => 4, "Pluto" => 5}
{"Mars" => 20, "Jupyter" => 2, "Saturn" => 3, "Earth" => 4, "Pluto" => 5}