从ruby中的数组中获取最新版本

Question

I have an array of version numbers called unique_versions that keeps on increasing :

1.7.16
1.7.14
1.7.13
1.7.12
1.7.9
1.7.7
1.7.5
1.7.4
1.7.2
1.6.2
1.2.1
1.2.0
1.1.0
0.0.1

and I need to get the latest(1.7.16) from the array. What the most elegant ruby way of doing it ? I get this array by the following code :

require "json"
require "open-uri"
require 'openssl'

string_object = open("https://xxx", :http_basic_authentication=>["xxx"], :ssl_verify_mode=>OpenSSL::SSL::VERIFY_NONE)
json_file = JSON.parse(string_object.read)
version_array = Array.new
json_file["results"].each do |version|
    version_array.push(version["version"].sub /-.*$/, '')
end
unique_versions=(version_array.uniq)

Answer 1

版本处理已在Gem::Version （以及其他版本）中实现，无需重新发明轮子。

string_versions.max_by{ |s| Gem::Version.new(s) } # => "1.7.16"

Answer 2

This seems to work

unique_versions.sort_by { |version| version.split('.').map(&:to_i) }
 => ["0.0.1", "1.1.0", "1.2.0", "1.2.1", "1.6.2", "1.7.2", "1.7.4", "1.7.5", "1.7.7", "1.7.9", "1.7.12", "1.7.13", "1.7.14", "1.7.16"]

so

unique_versions.max_by { |version| version.split('.').map(&:to_i) }
 => "1.7.16" 

Note that you can rewrite this part

version_array = Array.new
json_file["results"].each do |version|
    version_array.push(version["version"].sub /-.*$/, '')
end
unique_versions=(version_array.uniq)

in something like

 unique_versions = json_file["results"].map { |version| version["version"].sub /-.*$/, '' }.uniq