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Created October 5, 2016 08:36 — forked from staltz/
The introduction to Reactive Programming you've been missing

The easiest way to transition between pie charts with differently-sized datasets (while maintaining object constancy) is to set the missing values to zero.

function type(d) {
  d.apples = +d.apples || 0;
  d.oranges = +d.oranges || 0;
  return d;