We could circumvent this by making `%%` analogous to `**`. That is, we could provide a function form `Math.mod` as well as an infix operator `%%`.

On Thursday, August 15, 2019 9:46:57 AM CEST Andrea Giammarchi wrote: > FWIW another disadvantage is that operators cannot be polyfilled, so it'll > take forever for those not using transpilers to adopt these, while having a > `Math,mod` would work right away > > On Thu, Aug 15, 2019 at 8:40 AM Claude Pache <claude.pa...@gmail.com> wrote: > > Le 12 août 2019 à 22:00, Matthew Morgan <mmm...@zips.uakron.edu> a écrit : > > > > JS needs a modulo operator. It currently has the remainder operator `%` > > which works in most cases except for negative values. I believe the the > > `%%` would work great and be easy to remember. > > > > let x = (-13) %% 64; > > is equivalent to > > let x = ((-13 % 64) + 64) % 64; > > > > > > Is there a strong advantage of an `%%` operator over a `Math.mod()` > > function? There is the precedent of the `**` operator implemented as > > alternative of `Math.pow()` few years ago. It would be interesting to hear > > the feedback of those that use regularly powers, whether the benefit was > > clear (personally, I almost never use either `Math.pow()` or `**`, so that > > I can’t say anything). > > > > At least one disadvantage of an operator over a function, is that you have > > to think about precedence. The problem is exacerbated in JS, because > > (following some other languages) the unary minus has an uncanny high > > precedence level, confusingly very different than the one of the binary > > minus; so that, after having designed `**`, it was realised at the last > > minute that `-a**b` would be dumbly interpreted as `(-a)**b` instead of > > `-(a**b)` or `0-a**b`, as anybody who would be likely to actually use the > > operator would expect. (That particular issue was resolved in a hurry by > > making the parenthesis-left form a syntax error.) > > > > —Claude > > > > _______________________________________________ > > es-discuss mailing list > > es-discuss@mozilla.org > > https://mail.mozilla.org/listinfo/es-discuss

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