blocks|key|1360691|text|您可以使用Versionomy+gem+(在github上提供)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1360692|require+'versionomy'

v1+=+Versionomy.parse('0.1')
v2+=+Versionomy.parse('0.2.1')
v3+=+Versionomy.parse('0.44')

v1+<+v2++#+=>+true
v2+<+v3++#+=>+true

v1+>+v2++#+=>+false
v2+>+v3++#+=>+false|code-block|syntax|javascript|1360693|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/dazuma/versionomy|1^0|5|A|5|E|0|M|6|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]|$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]|S|$5|N|O|P|E|$Q|R]]]]

You can use the <a href="http://github.com/dazuma/versionomy" rel="noreferrer"><code>Versionomy</code> gem</a> (available at <a href="http://github.com/dazuma/versionomy" rel="noreferrer">github</a>):

<pre><code>require 'versionomy'

v1 = Versionomy.parse('0.1')
v2 = Versionomy.parse('0.2.1')
v3 = Versionomy.parse('0.44')

v1 &lt; v2 # =&gt; true
v2 &lt; v3 # =&gt; true

v1 &gt; v2 # =&gt; false
v2 &gt; v3 # =&gt; false
</code></pre>

blocks|key|1360722|text|如果你想在不使用任何gem的情况下手动完成这项工作，下面这样的代码应该可以使用，尽管它看起来有点不对劲。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1360723|versions+=+[+'0.10',+'0.2.1',+'0.4'+]
versions.map{+%7Cv%7C+(v.split+'.').collect(&:to_i)+}.max.join+'.'|code-block|syntax|javascript|1360724|本质上，您将每个版本字符串转换为一个整数数组，然后使用array+comparison+operator。您可以分解组件步骤，以便在需要有人维护的代码中执行一些更容易执行的操作。|offset|length|1360725|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core/classes/Array.html#M002204^0|0|0|R|P|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you want to do it by hand without using any gems, something like the following should work, though it's a little perly looking.

<pre><code>versions = [ '0.10', '0.2.1', '0.4' ]
versions.map{ |v| (v.split '.').collect(&amp;:to_i) }.max.join '.'
</code></pre>

Essentially, you turn each version string in to an array of integers and then use the <a href="http://ruby-doc.org/core/classes/Array.html#M002204" rel="noreferrer">array comparison operator</a>. You could break out the component steps to get something a little easier to follow if this is going in code somebody will need to maintain.

blocks|key|1360730|text|class+Version+<+Array
++def+initialize+s
++++super(s.split('.').map+{+%7Ce%7C+e.to_i+})
++end
++def+<+x
++++(self+<=>+x)+<+0
++end
++def+>+x
++++(self+<=>+x)+>+0
++end
++def+==+x
++++(self+<=>+x)+==+0
++end
end
p+[Version.new('1.2')+<+Version.new('1.2.1')]
p+[Version.new('1.2')+<+Version.new('1.10.1')]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1360731|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>class Version &lt; Array
 def initialize s
 super(s.split('.').map { |e| e.to_i })
 end
 def &lt; x
 (self &lt;=&gt; x) &lt; 0
 end
 def &gt; x
 (self &lt;=&gt; x) &gt; 0
 end
 def == x
 (self &lt;=&gt; x) == 0
 end
end
p [Version.new('1.2') &lt; Version.new('1.2.1')]
p [Version.new('1.2') &lt; Version.new('1.10.1')]
</code></pre>

blocks|key|1145686|text|Gem::Version.new('0.4.1')+>+Gem::Version.new('0.10.1')|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1145687|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Gem::Version.new('0.4.1') &gt; Gem::Version.new('0.10.1')
</code></pre>

blocks|key|1145705|text|Gem::Version是最简单的方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1145706|%25w<0.1+0.2.1+0.44>.map+{%7Cv%7C+Gem::Version.new+v}.max.to_s
=>+"0.44"|code-block|syntax|javascript|1145707|entityMap^0|0|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

<code>Gem::Version</code> is the easy way to go here:

<pre><code>%w&lt;0.1 0.2.1 0.44&gt;.map {|v| Gem::Version.new v}.max.to_s
=&gt; "0.44"
</code></pre>

blocks|key|1145739|text|如果你需要检查pessimistic+version+constraints，你可以这样使用Gem::Dependency：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1145740|Gem::Dependency.new('',+'~>+1.4.5').match?('',+'1.4.6beta4')|code-block|syntax|javascript|1145741|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.rubygems.org/read/chapter/16|1|http://rubygems.rubyforge.org/rubygems-update/Gem/Dependency.html^0|7|V|0|1A|F|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

If you need to check <a href="http://docs.rubygems.org/read/chapter/16">pessimistic version constraints</a>, you can use <a href="http://rubygems.rubyforge.org/rubygems-update/Gem/Dependency.html">Gem::Dependency</a> like this:

<pre><code>Gem::Dependency.new('', '~&gt; 1.4.5').match?('', '1.4.6beta4')
</code></pre>

blocks|key|1360843|text|我也有同样的问题，我想要一个Gem-less版本的比较器，想出了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1360844|def+compare_versions(versionString1,versionString2)
++++v1+=+versionString1.split('.').collect(&:to_i)
++++v2+=+versionString2.split('.').collect(&:to_i)
++++#pad+with+zeroes+so+they're+the+same+length
++++while+v1.length+<+v2.length
++++++++v1.push(0)
++++end
++++while+v2.length+<+v1.length
++++++++v2.push(0)
++++end
++++for+pair+in+v1.zip(v2)
++++++++diff+=+pair[0]+-+pair[1]
++++++++return+diff+if+diff+!=+0
++++end
++++return+0
end|code-block|syntax|javascript|1360845|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had the same problem, I wanted a Gem-less version comparator, came up with this:

<pre class="lang-ruby prettyprint-override"><code>def compare_versions(versionString1,versionString2)
 v1 = versionString1.split('.').collect(&amp;:to_i)
 v2 = versionString2.split('.').collect(&amp;:to_i)
 #pad with zeroes so they're the same length
 while v1.length &lt; v2.length
 v1.push(0)
 end
 while v2.length &lt; v1.length
 v2.push(0)
 end
 for pair in v1.zip(v2)
 diff = pair[0] - pair[1]
 return diff if diff != 0
 end
 return 0
end
</code></pre>

How to write a piece of code to compare some versions strings and get the newest? 

For example strings like: <code>'0.1', '0.2.1', '0.44'</code>.

How to compare versions in Ruby?

如何编写一段代码来比较某些版本的字符串并获取最新版本的字符串？例如：'0.1', '0.2.1', '0.44'这样的字符串。

问如何比较Ruby中的版本？
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