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jlokier · 2020-08-06 14:36:30

It has to be '?.(...)' not '?(...)', because '?(...)' is already part of valid syntax. For example "this.myOptionalfunction?('hello'):('goodbye')".

comprev | karma 2115 | avg karma 2.45 · | 2023-06-12 12:23:14

yes, the correct syntax would be: ./ not /.

packetlost | karma 3673 | avg karma 2.66 · | 2022-04-15 10:05:33

No, it doesn't. Using a '?' will cause a syntax error.

ofek | karma 511 | avg karma 4.09 · | 2023-08-29 08:18:48

That's not at all valid syntax, this does not work.

IshKebab | karma 13023 | avg karma 1.29 · | 2023-10-08 03:28:45

Nice! Pretty interesting syntax. Not sure about / for comments or the function argument syntax but you have a solid point about not using " or ' for strings!

ntoskrnl | karma 1028 | avg karma 5.04 · | 2022-05-19 10:57:44

LOL you're right! I just pasted the template here, but my defaults are equivalent to plain old `?`. I don't use the match if `?` would work.

marcoms | karma 55 | avg karma 0.95 · | 2015-07-03 10:02:38+00:00

You could use ` backticks instead and use both " and ' in strings without worry

gnoway | karma 1312 | avg karma 2.82 · | 2015-03-26 03:59:47+00:00

Why can't you (or node?) use the \\?\ syntax?

bjoli | karma 3519 | avg karma 1.96 · | 2021-11-03 18:18:37

There are functions starting with < and > so that's no good. And / and \ are already used elsewhere.

a3n | karma 11955 | avg karma 2.19 · | 2016-01-09 20:13:19+00:00

That's an expression, not a code block. I would not want to replace that with anything.

grumpydba | karma 281 | avg karma 1.2 · | 2019-09-13 12:16:42

I think saying 'written in X' != 'has API wrappers for X' .

cyphar | karma 11934 | avg karma 2.62 · | 2016-03-31 22:00:31+00:00

I started using ? as the leader (I don't do reverse searches). The other options (, \) always get in the way while programming. I might try the backtick, but it means that programming in languages that use backticks (Rust, I think) would be a pain.

rdancer | karma 880 | avg karma 1.64 · | 2015-12-16 18:56:31+00:00

How about "?????/??"?

kps | karma 7825 | avg karma 2.95 · | 2023-05-13 09:20:51

That's awful. Can you have "<=" = "=" and "<=" = "?" but "=" ? "?"?

rstuart4133 | karma 1916 | avg karma 1.75 · | 2021-03-23 10:27:00+00:00

Not quite. This works:

     (?:(?!>).)*>?

But that is a very long winded way of writing:

     [^>]*?>

which is long way of writing:

     [^>]*>

Pxtl | karma 17051 | avg karma 3.07 · | 2023-11-24 10:22:38

`...` is the standard.

Don't make language features that use three-dot-ellipsis as a keyword. Just like don't make a language where "Hello world" is a special string with special significance, or where variables named foo, bar, baz, quux, or i have special meaning.

I mean, it's nobody's fault but your own if you make a language feature that breaks industry conventions.

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nmeofthestate | karma 1958 | avg karma 3.2 · | 2022-09-26 06:57:34

Using 'is' and 'as' in this way is in line with C#.

marcosdumay | karma 27273 | avg karma 1.67 · | 2022-07-15 13:06:11

You want the "?" operator.

dpig_ | karma 158 | avg karma 1.23 · | 2023-09-26 04:35:59

> ?

which language does this?

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steveklabnik | karma 91260 | avg karma 5.08 · | 2023-01-18 12:51:56

To slightly elaborate on yccs27's good answer, at the moment, you can use ? for both Option<T> and Result<T, E>, but you can only use them in functions that return the same type, that is

  fn can_use_question_mark_on_option() -> Option<i32> {

  fn can_use_question_mark_on_result() -> Result<i32, ()> {

if you have them mixed in the body, they won't work directly. What you should/can do there depends on specifics. For example, if you have a function that returns Option and you have a Result inside, and you want any E to turn into None, you can add .ok() before the ? and then it still looks nice. (The compiler will even suggest this one!)