Ruby 使用 each_with_index

Question

我希望此方法遍历名称数组 katz_deli 中的每个项目，并使用 puts 显示名称及其索引。但是，输出只是数组中的 first 名称及其索引。

我的代码：

def line (katz_deli)
  if katz_deli.count > 1
    katz_deli.each_with_index {|name, index| puts "The line is currently: #{index +1}. #{name}" }
  else
    puts "The line is currently empty."
  end
end

我希望我的输出是 "The line is currently: 1. Logan 2. Avi 3. Spencer" 但是我得到 "The line is currently: 1. Logan." 谢谢！

Answer 1

def line (katz_deli)
  if katz_deli.count > 1
    print "The line is currently:"
    katz_deli.each_with_index {|name, index|  print " #{index +1}. #{name}" }
  else
    puts "The line is currently empty."
  end
end

Answer 2

您可以先构建输出字符串，puts一旦准备就绪：

input = ["Logan", "Avi", "Spencer"]

def line (katz_deli)
  if katz_deli.count > 1
    output = "The line is currently:"
    katz_deli.each_with_index do |name, index|
      output << " #{index +1}. #{name}"
    end
    puts output
  else
    puts "The line is currently empty."
  end
end

line(input)

Ruby 使用 each_with_index

Ruby using each_with_index

ruby

arrays

each

puts