guest271314 at gmail.com (2019-06-28T00:35:26.291Z)
How can the Selector/Select Expression be used with
`Array.prototype.find()`? What happens when the property is not defined?
For example using the same code for more than one browser
```
const stream = [canvasStream, videoTrack].find(({requestFrame: _}) => _);
```
the property `requestFrame` is either defined or not defined at
```canvasStream``` or ```videoTrack``` depending on the implementation.
Although the assigned variable can be reduced to 1 character at
destructuring assignment, there is still the redundancy of writing ```_```
again on the right side of ```=>```.
If the property is not found, is the result ```undefined```?
What is the least amount characters necessary using Selector/Select
Expression with ```find()```?
```
const stream = [canvasStream, videoTrack].find(.requestFrame);
```
?
How is the oppsosite written
```
const stream = [canvasStream, videoTrack].find(!.requestFrame);
```
?
How can the Selector/Select Expression be used with `Array.prototype.find()`? What happens when the property is not defined? For example using the same code for more than one browser ``` const stream = [canvasStream, videoTrack].find(({requestFrame: _}) => _); ``` the property `requestFrame` is either defined or not defined at ```canvasStream``` or ```videoTrack``` depending on the implementation. Although the assigned variable can be reduced to 1 character at destructuring assignment, there is still the redundancy of writing ```_``` again on the right side of ```=>```. If the property is not found, is the result ```undefined```? What is the least amount characters necessary using Selector/Select Expression with ```find()```? ``` const stream = [canvasStream, videoTrack].find(=.requestFrame); ``` ? On Thu, Jun 27, 2019 at 8:48 PM Bob Myers <rtm at gol.com> wrote: > Not exactly, since the optional chaining operator is `?.` with no space in > between. > > On Thu, Jun 27, 2019 at 1:37 PM Simon Farrugia <simonfarrugia26 at gmail.com> > wrote: > >> Also, without a leading token, a selector expr with the optional chaining >> operator inside a ternary operator would be ambiguous. >> >> ``` >> >> const contactSelector = true ? .contacts.email : .contacts.phone; >> >> ``` >> >> >> _______________________________________________ > es-discuss mailing list > es-discuss at mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20190628/7c1e60aa/attachment.html>