রুবি

user   = {}
result = user.empty?

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.key?("নাম")

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.has_key?("নাম")

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.value?("মোঃ আরিফ")

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.has_value?("মোঃ আরিফ")

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.fetch("নাম")

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.keys

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}
result = user.values

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.each do |key, value|
    puts "#{key}: #{value}"
end

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.each_key do |key|
    puts key
end

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.each_value do |value|
    puts value
end

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.select do |key, value|
    key == "নাম"
end

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.reject do |key, value|
    key == "নাম"
end

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.invert

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

info = {
    "শহর" => "ঢাকা"
}

result = user.merge(info)

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

info = {
    "শহর" => "ঢাকা"
}

user.update(info)

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.delete("নাম")

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.delete_if do |key, value|
    key == "নাম"
end

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.keep_if do |key, value|
    key == "নাম"
end

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

user.clear

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

info = {
    "শহর" => "ঢাকা"
}

user.replace(info)

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.dup

puts user

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.clone

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.default = "unknown"

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.inspect

puts result

user = {
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
}

result = user.hash

puts result