Why the window interval timer id doesn't start from 0?

Question

I want to know why the window interval timer starts from 132 or another number.

Chrome/75.0.3770.142 DevTool Console

const id = setInterval(()=>{
  console.log('hey bro');
},1000);
console.log(id);

1. Why it doesn't start from 0?

2. 0~131 what means in browser?

Answer 1

setInterval() returns an identifier for you be able to stop it later using clearInterval(). Example:

const id = setInterval(()=>{
    console.log('hey bro');
},1000);

setTimeout(() => {
    clearInterval(id);
}, 5001);