从Ruby中的.txt文件中查找唯一的姓氏

我需要从一个.txt文件中查找唯一的姓氏，该文件如下所示：

Kent, Mackenna -- ut
    Voluptatem ipsam et at.
Marven, Gardens -- non
    Facere et necessitatibus animi.
McLaughlinn, Matt -- consequatur
    Eveniet temporibus ducimus amet eaque.
Lang, August -- pariatur
    Unde voluptas sit fugit.
Brad, Nick -- et
    Maiores ab officia sed.
Adam, Levine -- error
    Repellendus alias officia amet et perspiciatis.
Learner, York -- nesciunt
    Incidunt et ut necessitatibus porro.
Ortiz, Andrew -- fuga
    Tempore eos et hic.
Lang, Bryant -- et
Laborum perferendis inventore eveniet.

def names(file_name)
  File.
    readlines(file_name).
    reject.
    with_index(1) { |_, id| id.even? }.
    map { |line| line.split(' --').first.split(', ') }.
    map { |ln, fn| { lastname: ln, firstname: fn } }
end

到目前为止，我已经：

FNAME = 'example.txt'

# maps for last name in file
def last_name_from_file(file_name)
  last_name = File.readlines(file_name).reject(&:empty?)
  last_name.map do |line|
    line.split.first
  end
end
puts last_name_from_file('example.txt')

但这给了我输出，其中包括Lorem文本和姓氏

#Kent
#Voluptatem
#Marven
#Facere
#McLaughlinn
#Eveniet
#Lang
#Unde
#Brad
...

---

正如我所见，lorem的线条是均匀的，所以你可以拒绝它们

def last_name_from_file(file_name)
  File.
    readlines(file_name).
    reject.
    with_index(1) { |_, id| id.even? }.
    map { |line| line.split(',').first }.
    uniq
end

---

好吧，我怎么才能知道你的名字

您可以这样做：

Kent, Mackenna -- ut
    Voluptatem ipsam et at.
Marven, Gardens -- non
    Facere et necessitatibus animi.
McLaughlinn, Matt -- consequatur
    Eveniet temporibus ducimus amet eaque.
Lang, August -- pariatur
    Unde voluptas sit fugit.
Brad, Nick -- et
    Maiores ab officia sed.
Adam, Levine -- error
    Repellendus alias officia amet et perspiciatis.
Learner, York -- nesciunt
    Incidunt et ut necessitatibus porro.
Ortiz, Andrew -- fuga
    Tempore eos et hic.
Lang, Bryant -- et
Laborum perferendis inventore eveniet.

def names(file_name)
  File.
    readlines(file_name).
    reject.
    with_index(1) { |_, id| id.even? }.
    map { |line| line.split(' --').first.split(', ') }.
    map { |ln, fn| { lastname: ln, firstname: fn } }
end

现在你可以称之为：

names = names('example.txt')

names
# => [{:lastname=>"Kent", :firstname=>"Mackenna"}, {:lastname=>"Marven", :firstname=>"Gardens"}, {:lastname=>"McLaughlinn", :firstname=>"Matt"}, {:lastname=>"Lang", :firstname=>"August"}, {:lastname=>"Brad", :firstname=>"Nick"}, {:lastname=>"Adam", :firstname=>"Levine"}, {:lastname=>"Learner", :firstname=>"York"}, {:lastname=>"Ortiz", :firstname=>"Andrew"}, {:lastname=>"Lang", :firstname=>"Bryant"}]

names.map { |name| name[:lastname] }
# => ["Kent", "Marven", "McLaughlinn", "Lang", "Brad", "Adam", "Learner", "Ortiz", "Lang"]

names.map { |name| name[:firstname] }
# => ["Mackenna", "Gardens", "Matt", "August", "Nick", "Levine", "York", "Andrew", "Bryant"]

类似于昨天的事情：

def last_name_from_file(fname)
  File.open(fname, "r").each_with_object([]).with_index do |(line, o), i|
    o << line.split(',').first if i.even?
  end.uniq
end

puts last_name_from_file('example.txt')

#Kent
#Marven
#McLaughlinn
#...

def last_name_from_file（fname）
open（fname，“r”）。每个_都带有_对象（[]）。带有_索引do |（行，o），i|
o让我们创建文件

FName = 'temp.txt'


IO.write（FName，
所有奇数行都缩进，但最后一行除外。如果它们总是缩进，请编辑示例；如果它们可能没有缩进，请这样说。请编辑以显示给定示例的完整预期结果。无论何时给出示例，请显示预期结果（作为Ruby对象）。好的，我如何获得第一个名称？