bbo/object_diff.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

var is_object = require('./is_object.js');
require('./get_tag.js');
require('./is_array.js');
require('./is_string.js');
require('./is_map.js');
require('./is_set.js');
var is_date = require('./is_date.js');
var is_empty = require('./is_empty.js');
var proper_object = require('./proper_object.js');

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

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

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

  if (is_date(l) || is_date(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 (is_object(difference) && is_empty(difference) && !is_date(difference)) return acc; // return no diff

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

module.exports = objectDiff;