Get an object property via a path like string

at.js

const obj = {
  name: "obj",
  userData: {
    position: {
      x: 3,
      y: 4,
      z: 10
    }
  }
}

const at = (obj, path) => {
  let keys = path.split(".");
  if (keys.length > 1) {
    return at(obj[keys[0]], keys.slice(1).join("."))
  }
  return obj[keys[0]];
}
 
at(obj,"userData.position.x") //=>3