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IO.writev for Ruby

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Daniel Berger

Posts: 1383
Nickname: djberg96
Registered: Sep, 2004

Daniel Berger is a Ruby Programmer who also dabbles in C and Perl

IO.writev for Ruby

Posted: May 1, 2010 10:44 PM

This post originated from an RSS feed registered with Ruby Buzz by Daniel Berger.
Original Post: IO.writev for Ruby Feed Title: Testing 1,2,3... Feed URL: http://djberg96.livejournal.com/data/rss Feed Description: A blog on Ruby and other stuff.	Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Daniel Berger Latest Posts From Testing 1,2,3...

Thanks to Eric Wong, the io-extra library (gem install io-extra) now has the IO.writev method. This allows you to perform "gather writes", i.e. the ability to write an array of strings as a single string.

fh = File.open('test.txt', 'a')
IO.writev(fh.fileno, %w[hello world]) # Write 'helloworld' to test.txt
fh.close

This might be useful for you if you have a large array of strings that you want to write to a file. By using IO.writev you avoid an unnecessary call to Array#join (and the memory that would consume), or a large number of calls to IO#write.

Enjoy.

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