method

join

Ruby latest stable (v1_8_6_287) - 1 note - Class: File

join(...) public

Returns a new string formed by joining the strings using File::SEPARATOR.

   File.join("usr", "mail", "gumby")   #=> "usr/mail/gumby"

Show source

/*
 *  call-seq:
 *     File.join(string, ...) -> path
 *  
 *  Returns a new string formed by joining the strings using
 *  <code>File::SEPARATOR</code>.
 *     
 *     File.join("usr", "mail", "gumby")   #=> "usr/mail/gumby"
 *     
 */

static VALUE
rb_file_s_join(klass, args)
    VALUE klass, args;
{
    return rb_file_join(args, separator);
}

October 9, 2008

3 thanks

Works with URLs too!

You can use it for web urls as well:

  path, file = File.split('/uploads/art/2869-speaking-of-pic.jpg')

  p path # => "/uploads/art"

  p file # => "2869-speaking-of-pic.jpg"

And you can also use join, to merge url back from the components:

  path = File.join(["/uploads/art", "2869-speaking-of-pic.jpg"])

  p path # => "/uploads/art/2869-speaking-of-pic.jpg"

Using #join and #split for operations on files and path parts of the URLs is generally better than simply joining/splitting strings by ’/’ symbol. Mostly because of normalization:

  File.split('//tmp///someimage.jpg') # => ["/tmp", "someimage.jpg"]

  '//tmp///someimage.jpg'.split('/') # => ["", "", "tmp", "", "", "someimage.jpg"]

Same thing happens with join.

join

Related methods

Works with URLs too!