Because C (B, BCPL, Algol). Too late to change JS where people do tricks such as !-x. No win in risking compat break.
/be On Fri, Sep 25, 2015 at 4:18 AM Herby Vojčík <he...@mailbox.sk> wrote: > > > Herby Vojčík wrote: > > > > > > 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 > > An off-topic thought: Unary minus (and plus) are only used with numbers > in JS. Why are they treated specially, not as hidden 0+x and 0-x, > respectively? That would be logical (unary plus and minus would have > same precendence as binary plus and minus). > > > 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. > > > > Herby > > _______________________________________________ > > es-discuss mailing list > > es-discuss@mozilla.org > > https://mail.mozilla.org/listinfo/es-discuss > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss >
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