Question

我有一个包含字符串和符号混合的数组。

array = ["candy", :pepper, "wall", :ball, "wacky"]

目标是返回以字母"wa"开头的第一个单词。

这是我的代码：

def starts_with_wa
  deleted_words = array.delete_if{|word| word.class == Symbol}
  ## deletes the symbols in the original array
  deleted_words.find do |w|
  ##it should iterate through the deleted_Words array but it shows error of undefined local variable or method "array" for main:Object
    w.start_with?('wa')
  end
end

starts_with_wa

Answer 1

您需要将array传递给您的方法，否则，它在方法范围内将不可见。此外，我建议一个简单的重构：

array = ["candy", :pepper, "wall", :ball, "wacky"]

def starts_with_wa(words)
  words.find { |word| word.is_a?(String) && word.start_with?('wa') }
end 

starts_with_wa(array)
#=> "wall"

Answer 2

您可以尝试以下操作

array.detect { |x| x.is_a?(String) && x.start_with?('wa') }

返回以“ wa”开头的数组中的第一个单词

2 个答案: