> The only case that arr.length could change, and hence the if statement taken, is if the if statement had already been taken - i.e. arr.length had already chan

> The only case that arr.length could change, and hence the if statement taken, is if the if statement had already been taken - i.e. arr.length had already changed. Fair point. I misread your original comment. To see this you need a more sophisticated analysis pass than V8 is capable of performing - something similar in spirit to sparse conditional constant propagation, V8's LICM just assumes that all blocks are reachable so it takes the union of all possible side-effects. > So that's not a good excuse. I am not making an excuse, I am simply stating a fact: this is a slide deck, it needs JS to operate. As simple as that. If there is an easy fix - please send me a PR[1], I will gladly take it [1] https://github.com/mraleph/mraleph.github.com/tree/master/talks/goto2015 https://github.com/mraleph/mraleph.github.com/tree/master/ta...