[javascript] How do I reset the setInterval timer?

How do I reset a setInterval timer back to 0?

var myTimer = setInterval(function() {
  console.log('idle');
}, 4000);

I tried clearInterval(myTimer) but that completely stops the interval. I want it to restart from 0.

Once you clear the interval using clearInterval you could setInterval once again. And to avoid repeating the callback externalize it as a separate function:

var ticker = function() {
    console.log('idle');
};

then:

var myTimer = window.setInterval(ticker, 4000);

then when you decide to restart:

window.clearInterval(myTimer);
myTimer = window.setInterval(ticker, 4000);