Output: setTimeout inside an object method, with a regular callback vs an arrow callback

1const timer = {
2  label: 'T',
3  regular() {
4    setTimeout(function () {
5      console.log(this.label);
6    }, 0);
7  },
8  arrow() {
9    setTimeout(() => console.log(this.label), 0);
10  },
11};
12timer.regular();
13timer.arrow();