Herby Vojčík (2015-09-25T11:09:58.000Z)

d at domenic.me (2015-10-12T20:23:27.560Z)

Claude Pache wrote: > > I just wonder why it is important that unary binds tighter? For > instance, before I carefully studied the issue of this thread, I have > never expected that unary minus binds tighter than binary multiplication > operator in expressions like `-2*x` (although it does not matter in that > case). > > Making the parentheses mandatory here will be somewhat annoying in > perfectly reasonable expressions, where you usually don’t use > parentheses in real math notation., like: > ``` > let s2 = - x**2 - y**2 - z**2 + t**2 > ``` I would overcome it and do not write the parens: let s2 = 0 - x**2 - y**2 - z**2 + t**2 Writing mandatory parens here is ugly. In fact, I am surprised "-2" is unary minus with 2, I thought it is number -2. And similarly to Claude, I always read -x*y in math notation, that is, as -(x*y). Luckily, for multiplication it does not matter.