擅长:python、mysql、java
<p>也许<a href="http://ruby-doc.org/core-2.0.0/Enumerable.html#method-i-select" rel="nofollow">^{<cd1>}</a>就是你想要的?在</p>
<pre><code>lists = ['dave','austin','bob','jimmy','john','jimmy']
lists.select{|x| x == 'jimmy'} # => ["jimmy", "jimmy"]
</code></pre>