Den 2019-04-17 kl. 16:14, skrev Larry Garfield:
On Sun, Apr 14, 2019, at 11:52 AM, Nikita Popov wrote:
So, there's been quite a bit of extra discussion here... unfortunately I
can't say that it really clarified anything, we're still circling around
different syntax choices, with the main contenders being fn, \ and ==>.
fn($x) => $x
fn($x, $y) => $x*$y
\$x => $x
\($x, $y) => $x*$y
$x ==> $x
($x, $y) ==> $x*$y
I think the main qualities of these possibilities are:
* Implementation complexity: fn and \ are easy, ==> is hard (lexer hack).
* Availability of reduced syntax: \ an ==> have a special single-argument
syntax, fn doesn't.
* Obviousness/readability: fn and ==> are obvious, while \ is not.
Especially \$x => $x looks quite obscure to the uninitiated (is that a
variable escape, like it would be in strings?)
At this point I'm considering to either a) move forward with fn() as the
choice I'd consider most likely to gather a consensus or b) have a
secondary three-way vote between these three syntax choices.
Nikita
I was under the impression from your earlier comments that ==> made the lexer
too unhappy to even consider. Is that not the case?
From a usability POV, I think ==> has the edge; it's reasonably self-documenting and has
a short-circuit version that is still highly readable and not confusing. It also fits the
"think of it as an expression not a function call" mindset, which is important.
The only downside is the implementation complexity. I think you have final call on whether
that would be too-ugly implementation-wise.
If it doesn't make the lexer too unhappy ==> is my preference, I think. \$x I'd probably
get used to, even if it is a bit ugly. fn() is the "safe" option: Most verbose
but keeps the lexer happy.
--Larry Garfield
Spot on I would say!
The comment "think of it as an expression not a function call" captures
my own hesitation for the fn() syntax quite well. Anyway it's in voting,
so glad we finally got this truck moving :)
r//Björn L
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