Omit empty properties

omit-empty.js

/**
 * Created on 2/9/16.
 * @author rankun203
 */
'use strict';
const _ = require('lodash');

/**
 * Omit property when empty value
 *
 * <pre>
 const params = oe({
    email: where.email,
    id   : oe({
      '$lt': where.maxId
    })
  });
 * </pre>
 * @param {object} o the object.
 */
module.exports = function omitEmpty(o) {
  return _.omit(o, function (v) {
    if (!v) return {};
    if (typeof v === 'object') return Object.getOwnPropertyNames(v).length === 0;
    return !v;
  });
};