Rhino is an open-source implementation of JavaScript written entirely in Java
Pull request Compare This branch is 635 commits behind mozilla:master.
Latest commit 702abfe Jul 28, 2011 @hns hns Prevent various array methods from setting empty slots in sparse arra…
…ys to undefined.

Defining an array element as undefined yields a similar result as not defining it,
but the `in` operator will report the element as present. Affected methods are
reverse(), shift(), unshift(), slice(), splice(), and concat().

Also adds doctests for said methods on both sparse and dense arrays.
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Rhino: JavaScript in Java<p>
Rhino is an implementation of JavaScript in Java. Documentation can be found 
<a href="http://www.mozilla.org/rhino/index.html">here</a>.