I agree, but closures and bine are expensive--present in both cases. It's better to avoid it. Granted, this is a contrived example and sometimes closures are the more elegant solution.
function Person() {
this.age = 0;
setInterval(this.incAge, 1000, this);
}
Person.prototype.incAge = function personIncAge(that) {
that.age += 1;
};
1. I already gave an out for your point. Yes, always weigh performance vs. clarity and don't over optimize.
2. You are making an assumption that you aren't binding thousands of times a second. You need to take actual use case into consideration.
3. My example has a 1000:1 method call to bind ratio and it's still a significant difference in benchmarks. Yes, it's that expensive it's important to think about in critical sections of code.
