Quick personal lodash tester

lodashtest.js

//Credit: https://stackoverflow.com/questions/25047463/group-by-and-sum-using-underscore-lodash/45287338

var _ = require('lodash');

const data = [
  {
    shape: 'foo',
    sides: 15,
    len: 4
  },
  {
    shape: 'foo',
    sides: 12,
    len: 3
  },
  {
    shape: 'foo',
    sides: 12,
    len: 1
  },
  {
    shape: 'bar',
    sides: 6,
    len: 5
  },
  {
    shape: 'baz',
    sides: 10,
    len: 1
  }
];
const T = 2;

var output = _(data)
  .groupBy('shape')
  .map((s, id) => ({
    shape: id,
    avgOfSides: _.meanBy(s, 'sides'),
    countSides: Object.values(_.countBy(s, 'shape'))[0]
  }))
  .orderBy('avgOfSides', 'desc')
  .value();

  _.filter(output, function(o) {return o.countSides > T})

console.log(output);