Javscript Set Deep Value

setDeepValue.js

function setDeepValue (path, value, separator = '.', target) {

  path = path.split(separator);

  var obj = null;
  var res = Object.assign({}, (target ? target : this));
  var current = res;

  for (var i = 0; i < path.length; i++) {

    if (i === (path.length - 1)) {
      obj = value;
    } else {
      obj = {};
    }

    current[path[i]] = obj;
    current = obj;
  }

  return res;

}