Maybe good enough for interview Simpliest Version of deepClone.

simplestDeepClone.js

/**
 *  Maybe good enough for interview Simpliest Version of deepClone.
 * Problems:
 * 1. the type check of object is not strict
 * 2. did not cover array
 * 3. did not cover null
 * @param {Object} sourceObj
 * @returns
 */
var deepCloneSimple = (sourceObj) => {
  let result = {};
  for (let key in sourceObj) {
    if (Object.prototype.hasOwnProperty.call(sourceObj, key)) {
      if (typeof sourceObj[key] === 'object') {
        result[key] = deepCloneSimple(sourceObj[key]);
      } else {
        result[key] = sourceObj[key];
      }
    }
  }
  return result;
};