将每个数组元素添加到ruby中的文件行中

If I have an array of strings e.g.

如果我有一个字符串数组。

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:

我想把元素输出到一个文件(例如。txt)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?

这给出了测试一行上的数组。txt文件。如何对数组进行迭代，向文件的新行添加每个值?

5 个解决方案

#1

Either use Array#each to iterate over your array and call IO#puts to write each element to the file (puts adds a record separator, typically a newline character):

或者使用数组#each遍历数组并调用IO#put将每个元素写入文件(放入一个记录分隔符，通常是一个换行字符):

File.open("test.txt", "w+") do |f|
  a.each { |element| f.puts(element) }
end

Or pass the whole array to puts:

或将整个数组传递给put:

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。

#2

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"))

#3

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，您可以使用“\n”来连接数组，以便每个元素都位于一条新线上，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:

如果您不希望覆盖文本文件中已有的值，以便在底部添加新信息，您可以这样做:

a = %w(a b c d)

File.open('test.txt', 'a') {|f| f << "\n#{a.join("\n")}"}

#4

Use Array#each to iterate each element. When writing to the file, make sure you append newline(\n), or you will get a file with abcd as content:

使用数组#each迭代每个元素。在写入文件时，确保添加了newline(\n)，否则将会得到一个包含abcd的文件，内容如下:

a = ['a', 'b', 'c', 'd']
File.open('test.txt', 'w') do |f|
  a.each do |ch|
    f.write("#{ch}\n")
  end
end

#5

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")) }

#1