>If you make it a rule to avoid using 'let' everywhere, then you lose the safety mechanism of block scope variables, something that a lot of people agree is a g

>If you make it a rule to avoid using 'let' everywhere, then you lose the safety mechanism of block scope variables, something that a lot of people agree is a good idea. Which is why I said its bad practice in specific cases, currently. 2.5 Million iterations is a use case, not a general rule. Programming is complicated, and as such you should know not to make the assumption that a use case isn't going to apply everywhere. Rather, you can say that microseconds of performance difference aren't a good reason to not use let, unless, you're not using something that compiles down to var, and you're going into the millions of iterations. But, the point I was trying to make is that even when you talk about performance problems, devs jump the gun to 'pre-optimization', partially because they themselves don't know how well code performs, and partially because of misapplied dogmatism.