在Ruby中读取文件的常用方法是什么？ [英] What are all the common ways to read a file in Ruby?

问题描述

例如，下面是一个方法：

  fileObj = File.new（$ fileName，r）
 while（line = fileObj.gets）
 puts（line）
 end 
 fileObj.close 
  

我知道Ruby非常灵活。什么是每种方法的好处/缺点？

解决方案

  File.open（my / file / path，r）do | f | 
 f.each_line do | line | 
 puts line 
 end 
 end 
＃文件在块结尾自动关闭
  

也可以像上面那样明确地关闭文件（将块传给打开为你关闭）：

  f = File.open（my / file / path，r）
 f.each_line do | line | 
 puts line 
 end 
 f.close 
  

What are all the common ways to read a file in Ruby?

For instance, here is one method:

fileObj = File.new($fileName, "r")
while (line = fileObj.gets)
  puts(line)
end
fileObj.close

I know Ruby is extremely flexible. What are the benefits/drawbacks of each approach?

解决方案

File.open("my/file/path", "r") do |f|
  f.each_line do |line|
    puts line
  end
end
# File is closed automatically at end of block

It is also possible to explicitly close file after as above (pass a block to open closes it for you):

f = File.open("my/file/path", "r")
f.each_line do |line|
  puts line
end
f.close

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