Swift style syntax

[Mohsen Azimi]

> Your syntax is ambiguous: Should your code be interpreted as:
>
>    let passed = objs.filter($0 => $0.passed)
>
> or:
>
>    let passed = $0 => objs.filter($0.passed)

I don't understand why you parsed it in the second way Claude?


A more real world like example would be this:

```
let chbx = Array.from(document.querySelectorAll('input[type="checkbox"]'));

let checkedBoxes = chbx.filter(#0.checked)
```

On Sun, Oct 11, 2015 at 11:40 PM Isiah Meadows <isiahmeadows at gmail.com>
wrote:

> Interesting trick, Andrea. Never thought of that before.
>
> On Mon, Oct 12, 2015, 02:31 Andrea Giammarchi <andrea.giammarchi at gmail.com>
> wrote:
>
>> ... sort of (no  pun intended)
>>
>> ```js
>> let sorted = names.sort((...$) => $[0] > $[1]);
>> ```
>>
>> Regards
>>
>> On Mon, Oct 12, 2015 at 2:58 AM, Frankie Bagnardi <f.bagnardi at gmail.com>
>> wrote:
>>
>>> I don't think there's much value in this. Also sort is a bad example
>>> because it'd look like this, and there's no nifty shortcut answer to it.
>>>
>>> ```js
>>> names.sort((a, b) => a < b ? 1 : a > b ? -1 : 0);
>>> ```
>>>
>>> In most cases you save a couple characters, but you can just use
>>> x/y/a/b/f/g/n/xs/xss for variable names in arrow functions instead of the
>>> $0 (which would likely be \0 in js).
>>>
>>>
>>>
>>> On Sun, Oct 11, 2015 at 3:26 PM, Caitlin Potter <caitpotter88 at gmail.com>
>>> wrote:
>>>
>>>> In the case of sorting, are arrow functions not good enough? Or are we
>>>> really asking for full continuation support
>>>>
>>>> On Oct 11, 2015, at 5:51 PM, Alexander Jones <alex at weej.com> wrote:
>>>>
>>>> IMO this is a good idea. When it's abundantly clear from context, I've
>>>> already been naming my arrow function params _ if singular, and _1, _2 etc
>>>> if several. As always, picking some punctuation straight from the scarce
>>>> and sacred set of remaining ASCII symbols is going to be tricky. (If only
>>>> we could just go APL on this!)
>>>>
>>>> On 11 October 2015 at 16:45, Mohsen Azimi <me at azimi.me> wrote:
>>>>
>>>>> Is it possible to extend JavaScript syntax to support Swift style
>>>>> block syntax[1]?
>>>>>
>>>>> In Swift it's possible to omit return keyword
>>>>> ```
>>>>>
>>>>>    1. reversed = names.sort( { s1, s2 in s1 > s2 } )
>>>>>
>>>>> ```
>>>>>
>>>>> or omit argument declaration like this:
>>>>>
>>>>> ```
>>>>>
>>>>>    1. reversed = names.sort( { $0 > $1 } )
>>>>>
>>>>> ```
>>>>>
>>>>> or apply an operator to arguments of a function
>>>>>
>>>>> ```
>>>>>
>>>>>    1. reversed = names.sort(>)
>>>>>
>>>>> ```
>>>>> We have the first feature in ES2015 already:
>>>>>
>>>>> ```
>>>>> let sorted = names.sort((a, b)=> a > b);
>>>>> ```
>>>>>
>>>>> But for omitting argument declaration we need to find an alternative
>>>>> to $0, $1... since those are valid variable names in JS. Maybe we can use
>>>>> #0, #1... instead.
>>>>>
>>>>> This is very useful for functional programming aspect of JS. For
>>>>> example in a filter function:
>>>>>
>>>>> ```
>>>>> let passed = objs.filter(#0.passed)
>>>>> ```
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> [1][
>>>>> https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html
>>>>> ]
>>>>>
>>>>> _______________________________________________
>>>>> es-discuss mailing list
>>>>> es-discuss at mozilla.org
>>>>> https://mail.mozilla.org/listinfo/es-discuss
>>>>>
>>>>>
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