x = "Global";

objArrow = {
  x: "Object with arrow method",
  logX: () => { console.log(this.x); }
}

objNormal = {
  x: "Object with normal method",
  // ES6 shorthand notation for normal function
  logX () { console.log(this.x); }
}

objArrow.logX();  // "Global"
arrowX = objArrow.logX;
arrowX();  // "Global"

objNormal.logX();  // "Object with normal method"
normalX = objNormal.logX;
normalX();  // "Global"