bbo/es/updated_diff.js

bbo is a utility library of zero dependencies for javascript.

import isObject from './is_object.js';
import './get_tag.js';
import './is_array.js';
import './is_string.js';
import './is_map.js';
import './is_set.js';
import isDate from './is_date.js';
import isEmpty from './is_empty.js';
import properObject from './proper_object.js';

var updatedDiff = (lhs, rhs) => {
  if (lhs === rhs) return {};
  if (!isObject(lhs) || !isObject(rhs)) return rhs;
  var l = properObject(lhs);
  var r = properObject(rhs);

  if (isDate(l) || isDate(r)) {
    // eslint-disable-next-line eqeqeq
    if (l.valueOf() == r.valueOf()) return {};
    return r;
  }

  return Object.keys(r).reduce((acc, key) => {
    if (l.hasOwnProperty(key)) {
      var difference = updatedDiff(l[key], r[key]);
      if (isObject(difference) && isEmpty(difference) && !isDate(difference)) return acc;
      return { ...acc,
        [key]: difference
      };
    }

    return acc;
  }, {});
};

export default updatedDiff;