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    <p>The <code>Range</code> class in Ruby only supports closed and half-open (right-open) ranges. However, you can easily write your own.</p> <p>Here's an example of a half-open range in Ruby:</p> <pre><code>range = 1.0...10.0 range === 1.0 # =&gt; true range === 10.0 # =&gt; false </code></pre> <p>The total line count for the Ruby 1.9 compliant <code>Range</code> class in Rubinius is 238 lines of Ruby code. If you don't need your open range class to support every wrinkle, corner case, special case, idiosyncrasy, backwards-compatibility quirk and so on of the Ruby Language Specification you can get by with a lot less than that.</p> <p>If you really only need to test for inclusion, then something like this should suffice:</p> <pre><code>class OpenRange attr_reader :first, :last def initialize(first, last, exclusion = {}) exclusion = { first: false, last: false }.merge(exclusion) @first, @last, @first_exclusive, @last_exclusive = first, last, exclusion[:first], exclusion[:last] end def first_exclusive?; @first_exclusive end def last_exclusive?; @last_exclusive end def include?(other) case [first_exclusive?, last_exclusive?] when [true, true] first &lt; other &amp;&amp; other &lt; last when [true, false] first &lt; other &amp;&amp; other &lt;= last when [false, true] first &lt;= other &amp;&amp; other &lt; last when [false, false] first &lt;= other &amp;&amp; other &lt;= last end end alias_method :===, :include? def to_s "#{if first_exclusive? then '(' else '[' end}#@first...#@last#{if last_exclusive? then ')' else ']' end}" end alias_method :inspect, :to_s end </code></pre>
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    1. POOpen ranges in Ruby using floats?
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    1. USJörg W Mittag
    1. USJörg W Mittag
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    1. COTidy trick with the case on the array.
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      1. USmattfitzgerald
    2. COAt first I started out to remove and minimize duplication with a nested `if`, but that one is just so much clearer, even though all the individual comparisons are duplicated. DRY is a guideline not a mantra.
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