Convert flat array of objects into nested array of objects

Question

Original JSON data (flat table):

[
    {\"id\":\"1\",\"first_name\":\"Jason\",\"last_name\":\"Martin\",\"start_date\":\"1996-07-25\",\"end_date\":\"2006-07-25\",         


        

Answer 1

Building on the example provided by @nrabinowitz, here's the nest function with the originally proposed API of passing the collection and an array of property names as args, using d3.nest under the hood:

function nest(data, keys) {
  var nest = d3.nest();
  keys.forEach(function(k) { 
    nest.key(function(d) {
      return d[k];
    })
  });
  return nest.entries(data);
}