将每个数组元素添加到 ruby 文件的行中
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Add each array element to the lines of a file in ruby
提问by edc505
If I have an array of strings e.g.
如果我有一个字符串数组，例如
a = ['a', 'b', 'c', 'd']
and I want to output the elements, to a file (e.g. .txt) one per line. So far I have:
我想将元素输出到一个文件（例如 .txt）中，每行一个。到目前为止，我有：
File.new("test.txt", "w+")
File.open("test.txt", "w+") do |i|
i.write(a)
end
This gives me the array on one line of the test.txt file. How can I iterate over the array, adding each value to a new line of the file?
这给了我 test.txt 文件一行上的数组。如何遍历数组，将每个值添加到文件的新行？
回答by Stefan
Either use Array#eachto iterate over your array and call IO#putsto write each element to the file (putsadds a record separator, typically a newline character):
要么用于Array#each遍历数组并调用IO#puts将每个元素写入文件（puts添加记录分隔符，通常是换行符）：
File.open("test.txt", "w+") do |f|
a.each { |element| f.puts(element) }
end
Or pass the whole array to puts:
或者将整个数组传递给puts：
File.open("test.txt", "w+") do |f|
f.puts(a)
end
From the documentation:
从文档：
If called with an array argument, writes each element on a new line.
如果使用数组参数调用，则在新行上写入每个元素。
回答by Josip ?urakovi?
There is a quite simpler solution :
有一个非常简单的解决方案：
IO.write("file_name.txt", your_array.join("\n"))
回答by tigeravatar
As an alternate, you could simply join the array with "\n" so that each element is on a new line, like this:
作为替代方案，您可以简单地使用 "\n" 加入数组，以便每个元素都在一个新行上，如下所示：
a = %w(a b c d)
File.open('test.txt', 'w') {|f| f.write a.join("\n")}
If you don't want to override the values already in the text file so that you're simply adding new information to the bottom, you can do this:
如果您不想覆盖文本文件中已有的值，而只是在底部添加新信息，则可以执行以下操作：
a = %w(a b c d)
File.open('test.txt', 'a') {|f| f << "\n#{a.join("\n")}"}
回答by falsetru
Use Array#eachto iterate each element. When writing to the file, make sure you append newline(\n), or you will get a file with abcdas content:
使用Array#each迭代每个元素。写入文件时，请确保附加换行符( \n)，否则您将得到一个abcd内容如下的文件：
a = ['a', 'b', 'c', 'd']
File.open('test.txt', 'w') do |f|
a.each do |ch|
f.write("#{ch}\n")
end
end
回答by andriy
Another simple solution:
另一个简单的解决方案：
directory = "#{Rails.root}/public/your_directory" #create your_directory before
file_name = "your_file.txt"
path = File.join(directory, file_name)
File.open(path, "wb") { |f| f.write(your_array.join("\n")) }
