text: var groupBy = require('../')
    createTestData = require('./create-test-data.js');
  console.log('Creating random features.....'); 
  createTestData(100000, function(data) {
    console.log('created random 100,000 features');
    var features = data.features;
    
    console.time('group features and merge geometries to multigeometries') 
    groupBy(features, ['properties.address.city']);
    console.timeEnd('group features and merge geometries to multigeometries') 
    
    console.time(
      'group features, merge geometries to multigeometries and collect ids') 
    groupBy(features, [{
      property: 'properties.price', 
      intervals: [10000, 30000, 70000, 10000]
    }],['id'])
    console.timeEnd(
      'group features, merge geometries to multigeometries and collect ids') 
  });
  