Question

我有一个像

这样的数组

%w(Dog Cat Bird Rat).each_with_index do |element, index|
# "w" for word array
# It's a shortcut for arrays

  puts ("%-4s + #{index}" % element)    
end

这将输出类似

的内容

Dog + 0
Cat + 1
Bird + 2
Rat + 3

如果我想将动物变成诸如弦之类的东西怎么办？所以说它

This is string 0 + 0
This is string 1 + 1
This is string 2 + 2
etc

有办法吗？这不起作用：

%w('This is string 0', 'This is string 1', 'This is string 2', 'This is string 3').each_with_index do |element, index|
# "w" for word array
# It's a shortcut for arrays

  puts ("%-4s + #{index}" % element)    
end

Answer 1

如果您希望您的数组可以包含带空格的字符串，请以常规方式构建它。

['This is string 0', 'This is string 1', 'This is string 2', 'This is string 3'].each_with_index do |element, index|

请注意，这可以通过多种方式编写。一个较短的方法是

(0..3).map { |i| "This is string #{i}" }.each_with_index do |element, index|

Answer 2

只需使用“普通”数组语法：

['This is string 0', 'This is string 1', 'This is string 2', 'This is string 3'].each_with_index do |element, index|
  puts ("%-4s + #{index}" % element)    
end

This is string 0 + 0
This is string 1 + 1
This is string 2 + 2
This is string 3 + 3

如何正确地将数组元素分成字符串？

2 个答案: