join(...) public

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

   File.join("usr", "mail", "gumby")   #=> "usr/mail/gumby"
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October 9, 2008
6 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.

February 10, 2011
0 thanks

Eliminates Double Slashes

Also eliminates inadvertent double slashes:

path = '/uploads/art/'
file = '/pic.jpg'
File.join(path, file) # => '/uploads/art/pic.jpg'