Compares the properties of two objects and returns an array of paths to the properties of the baseObject that are different or nonexistent in the compareObject.

collect-different-properties.js

/**
 * Compares the properties of two objects and returns an array of paths to the 
 * properties of the baseObject that are different or non-existant in the 
 * compareObject.
 *
 * person0 = {
 *   name: {
 *     first: 'Eve'
 *   }
 * };
 *
 * person0 = {
 *   name: {
 *     first: 'Jim'
 *   }
 * };
 *  
 * collectDifferentProperties(1,1); // []
 * collectDifferentProperties(1,2); // [""]
 * collectDifferentProperties(person0, person1); // ["name.first"]
 */

function getDifferentProperties (baseObject, compareObject, ancestors, accumulator) {
  accumulator = accumulator || [];
  ancestors = ancestors || [];

  let isBaseAnObject = typeof baseObject === 'object' && !!baseObject;
  let areObjectsTheSameType = typeof baseObject === typeof compareObject;
  let isBaseAFunction = typeof baseObject === 'function';

  if (isBaseAnObject && areObjectsTheSameType) {
    Object.keys(baseObject).forEach(key => {
      let path = ancestors.concat(key);
      let value = baseObject[key];

      if (!baseObject.hasOwnProperty(key)) {
        return;
      }

      getDifferentProperties(baseObject[key], compareObject[key], path, accumulator);
    });
  } else if (!areObjectsTheSameType || !isBaseAFunction && baseObject != compareObject) {
    accumulator.push(ancestors.join('.'));
  }

  return accumulator;
}