clonedeep avoid removing null fields code example

Example: lodash remove undefined values from object

var person = {"name":"bill","age":21,"sex":undefined,"height":"crap"};
//remove undefined properties or other crap
var cleanPerson = _.pickBy(person, function(value, key) {
  return !(value === undefined || value === "crap");
});
//cleanPerson is now { "name": "bill","age": 21}