Sorting numeric strings in Ruby

Question

I've got an array of string version numbers which I'd like to sort but can't for the life of me get them to sort the way I want:

versions = [ "1.0.4", "1.0.6", "1.0.11", "1.1.9", "1.1.10", "1.0.16" ]

versions.sort_by {|v| [v.size]}
=> ["1.0.4", "1.0.6", "1.1.9", "1.0.11", "1.1.10", "1.0.16"]

Trying to achieve:

=> ["1.0.4", "1.0.6", "1.0.11", "1.0.16", "1.1.9", "1.1.10"]

It seems to have something to do with lexicographically but I'm having difficulty working out the sorting rule I need to apply.

Any help or a point in the right direction would be greatly appreciated.

Answer 1

versions = [ "1.0.4", "1.0.6", "1.0.11", "1.1.9", "1.1.10", "1.0.16" ]
sorted = versions.sort_by {|s| s.split('.').map(&:to_i) }
sorted # => ["1.0.4", "1.0.6", "1.0.11", "1.0.16", "1.1.9", "1.1.10"]

What this does is it splits strings into components and compares them numerically.