var hash = Hash.new(
    key1 => 'value1',
    key2 => 'value2',
)

# Iterate over key-value pairs
hash.each { |key, value|
    say "#{key}: #{value}";
}

# Iterate only over keys
hash.keys.each { |key|
    say key;
}

# Iterate only over values
hash.values.each { |value|
    say value;
}