MIT-style license.
Takashi Mizohata beatak@nydd.org
2008 [nydd](http://code.nydd.org/).
[nydd jslib](http://code.nydd.org/).
Everything is worthwhile / if the soul isn’t small.
Array.prototype.vacuum = function ()
Clean up array non-destractively. This method will get rid of undefined value from the array. Designed to be called after calling “delete array[i]”. The method caller will not be changed. See example.
prototype
arr = arr.vacuum();
(Array) array without undefined value in it. Index may be changed.
Clean up array non-destractively.
Array.prototype.vacuum = function ()