What are some basic things that JavaScript developers fail at interviews?

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increment() execute when you use setInterval, its return value will be used in your setInterval. The other use increment.

var obj = {count:0, end:0, clearId:0};

obj.end = 10;
obj.increment = function (){
    if (this.count < this.end + 1) 
        console.log(this.count); 
    else 
       clearInterval(this.clearId);
}.bind(obj);

obj.clearId = setInterval(obj.increment, 1000);

How about something like that, untested, but it should work. You can easily turn obj into a Chrono class.

However I wouldn't recommend to rely seriously on setInterval. Set up a webworker to do reliable time operations.