bbo/es/object_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 objectDiff = (lhs, rhs) => {
  if (lhs === rhs) return {}; // equal return no diff

  if (!isObject(lhs) || !isObject(rhs)) return rhs; // return updated rhs

  var l = properObject(lhs);
  var r = properObject(rhs);
  var deletedValues = Object.keys(l).reduce((acc, key) => {
    return r.hasOwnProperty(key) ? acc : { ...acc,
      [key]: undefined
    };
  }, {});

  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)) return { ...acc,
      [key]: r[key]
    }; // return added r key

    var difference = objectDiff(l[key], r[key]);
    if (isObject(difference) && isEmpty(difference) && !isDate(difference)) return acc; // return no diff

    return { ...acc,
      [key]: difference
    }; // return updated key
  }, deletedValues);
};

export default objectDiff;