selections in d3 are immutable. therefore, this:


... won't change what tr is. since you obviously want it to be the "update + enter" selections, you have to reassign it:

tr = tr.merge(tr.enter().append("tr"));

finally, i'd advise naming the enter selection, so the whole thing would be:

var trenter = tr.enter().append("tr");
tr = tr.merge(trenter);

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