Demo: jsFiddle

Code available as a GitHub Gist

Demo: jsFiddle

Code available as a GitHub Gist

Along with the usual code review criteria(mainly clarity), I am wondering if I just reinvented the wheel or overthought the whole problem. The code does seem a bit long for the functionality and I am not keen how how it directly modifies the object(wish it would return a new object). This means that you have to clone the data before every use to keep all the references to the original data happy.

Along with the usual code review criteria(mainly clarity), I am wondering if I just reinvented the wheel or overthought the whole problem. The code does seem a bit long for the functionality and I am not keen how it directly modifies the object(wish it would return a new object). This means that you have to clone the data before every use to keep all the references to the original data happy.