ruby - 如何在 Ruby 中循环嵌套数组

Question

对 Ruby 和一般编码非常陌生。我正在尝试遍历二维数组，但无法弄清楚。这是我拥有的:

--使用循环在不同的行上打印出每个人及其另一个 self 。

--布鲁斯·韦恩，又名 bat 侠

people = [
  ["Bruce", "Wayne", "Batman"],
  ["Selina", "Kyle", "Catwoman"],
  ["Barbara", "Gordon", "Oracle"],
  ["Terry", "McGinnis", "Batman Beyond"]
]

index = people[0][0]

first_name = people[0][0]
last_name = people[0][1]
hero_name = people[0][2]

4.times do
  puts first_name + " " + last_name + "," " " + "a.k.a" " " + hero_name
  index = index + 1
end

它确实打印了第一行但随后引发错误:

Bruce Wayne, a.k.a Batman
# `+': no implicit conversion of Integer into String (TypeError)

Answer 1

在 ruby​​ 中，我们不使用索引循环，例如 for 和 family；相反，我们迭代集合:

people =
  [["Bruce", "Wayne", "Batman"],
   ["Selina", "Kyle", "Catwoman"],
   ["Barbara", "Gordon", "Oracle"],
   ["Terry", "McGinnis", "Batman Beyond"]]

people.each do |first, last, nick|
  puts "#{first} #{last}, a.k.a #{nick}"
end

或

people.each do |first_last_nick|
  *first_last, nick = first_last_nick
  puts [first_last.join(' '), nick].join(', a.k.a ')
end