nested_nil.rb

# Return nested hash element, or nil if hash structure does not match

# no checking
def find_third(id)
  input = find_input(id)
  input['first']['second']['third']
end

# begin/rescue/end
def find_third(id)
  input = find_input(id)

  begin
    input['first']['second']['third']
  rescue
  end
end

# rescue nil
def find_third(id)
  input = find_input(id)
  input['first']['second']['third'] rescue nil
end

# return unless
def find_third(id)
  input = find_input(id)

  first = input['first']
  return unless first

  second = first['second']
  return unless second

  second['third']
end

# &&
def find_third(id)
  input = find_input(id)

  return unless input['first'] &&
    input['first']['second'] &&
    input['first']['second']['third']

  input['first']['second']['third']
end

# andand gem
def find_third(id)
  input = find_input(id)
  input['first'].andand['second'].andand['third']
end

# vine gem
def find_third(id)
  input = find_input(id)
  input.access('first.second.third')
end