Yes, the `1..9//2` communicates intention a little better than `a..b..c` IMO.
Amos King, CEO <https://twitter.com/binarynoggin> <https://www.facebook.com/BinaryNoggin/> <https://www.instagram.com/binarynoggin/> <https://www.linkedin.com/company/binary-noggin> 573-263-2278 a...@binarynoggin.com On Mon, Mar 22, 2021 at 9:05 AM José Valim <jose.va...@dashbit.co> wrote: > > >> I still find the syntax to be confusing with the step as the last >> element. I really wish that we could do something like `a..b by: 3` but >> that comes with other implementation issues. I like the proposals using a >> different operator for the step. `a..b\\c`? >> > > Unfortunately a..b\\c is ambiguous because \\ is used as default > arguments. So you could do "a..b\\1..3". It is semantically unambiguous in > this case, but definitely syntactically ambiguous. > > Here are some approaches of what we could allow. I am considering they all > represent the range from 1 to 9 by 2 and from 9 to 1 by -1: > > - 1..2..9 and 9..-1..1 - as someone proposed, maybe having the step in > the middle is clearer > > - 1..9//2 and 9..1//-1 - note // is generally ambiguous in Elixir > because of the capture operator. So this will only work if ..// is defined > as a ternary operator. This means we will likely introduce the atom :..// > and the capture operator would be &..///3. I think those are acceptable > trade-offs, but worth mentioning. > > - Combinations with \ and /: > - 1..9/\2 and 9..1/\-1 > - 1..9*\2 and 9..1*\-1 > - 1..9\/2 and 9..1\/-1 > - 1..9*/2 and 9..1*/-1 > > - 1..9^^2 and 9..1^^-2 > > To be honest, I like the first two. One nice bonus about 1..9//2 is > because we can actually think that it is cutting the number of elements in > 2, by some approximation. 1..8//1 has 8 elements. 1..8//2 has 4. :) > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elixir-lang-core+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4JNXVDdJG%3DJ2MuiiN9%2BxHNUm58%2Bi%3DAbPygGkZm6sZ4jEA%40mail.gmail.com > <https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4JNXVDdJG%3DJ2MuiiN9%2BxHNUm58%2Bi%3DAbPygGkZm6sZ4jEA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/CAJr6D4Trei49Sigy0Eb-i4Q60_C4MVHUz-gf7LP77btfjBzEqQ%40mail.gmail.com.
