试图在Ruby中打开文件 - 获取TypeError:无法将String转换为Integer

Question

不知道这里发生了什么,或者在这种情况下可能是整数.这是代码:

def build_array_from_file(filename)
    contents = []
    File.read(File.expand_path('lib/project_euler/' + filename), 'r') do |file|
      while line = file.get
        contents << line
      end
    end
    contents
  end

filename是一个字符串,我已经检查以确保路径有效.

有什么想法吗？谢谢.

Answer 1

File.read没有模式或块的第二个参数,即File.open:

contents_string = File.read(File.expand_path('lib/project_euler/' + filename))

请注意,您还可以写:

contents = File.open(path).lines # returns a lazy enumerator, keeps the file open

要么:

contents = File.readlines(path) # returns an array, the file is closed.