Uses a string representation of an object chain and traverses the actual object.

traverseObject.js

/**
 * Takes a string representaion of an object chain and traverses the real object to the
 * last key in the chain.
 *
 * @method _traverseObject
 * @private
 * @param  {String}       chain  - String represenation of an object chain.
 * @param  {Object}       object - The object to traverse.
 * @return {*}                   - The new position in the object.
 */
function traverseObject(chain, object) {
  const keys = chain.split('.');
  let output = object;
  for (let i = 0; i < keys.length; i++) {
    output = output[keys[i]];
  }
  return output;
}

traverseObject.ts

/**
 * Takes a string representaion of an object chain and traverses the real object to the
 * last key in the chain.
 *
 * @method _traverseObject
 * @private
 * @param  {String}       chain  - String represenation of an object chain.
 * @param  {Object}       object - The object to traverse.
 * @return {*}                   - The new position in the object.
 */
 function traverseObject<TObject, TOutput>(chain: string, object: TObject): TOutput {
  const keys = chain.split('.')
  // let output = object
  let output = { ...object }
  for (let i = 0; i < keys.length; i++) {
    output = output[keys[i]]
  }
  return output
}