bbo/es/added_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 isEmpty from './is_empty.js';
import properObject from './proper_object.js';

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

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

export default addedDiff;