Pure Javascript listen to input value change

Question

Is there any way I can create a constant function that listens to an input, so when that input value changes, something is triggered immediately?

I am looking for so

Answer 1

Actually, the ticked answer is exactly right, but the answer can be in ES6 shape:

HTMLInputElementObject.oninput = () => {
  console.log('run'); // Do something
}

Or can be written like below:

HTMLInputElementObject.addEventListener('input', (evt) => {
  console.log('run'); // Do something
});