New Assignment Operators (Not bit-wise OR)

Michael Theriot michael.lee.theriot at gmail.com
Tue Apr 19 01:22:44 UTC 2016


What scenarios do you need to declare a new variable equal to its current
declaration or a default value?

On Sun, Apr 17, 2016 at 8:21 AM, even stensberg <evenstensberg at gmail.com>
wrote:

> I've seen a lot of code using an extra type to have as a fallback. This to
> me seems like not a very good way of putting use of the logical OR. Here's
> an example:
>
> `var itemList = itemList || 'something went extremely wrong'`
>
>
> This is a really hacky way of doing things. I don't think you should
> assign your variable to a default by doing this.
>
>
> Been back and forth by this "issue" with some of the ReactJS members at
> GitHub, and while saying this is a "stylus" thing, I disagree. It is more
> about not reiterating your code.
>
> Options could be:
>
> -tenaries - long & !clean codelines
> -default params (ES) , though it won't be a general use case
>
> There is already a lot of assignment, string and so on operators, but I
> don't really seem any of them touch this, except maybe the bit-wise OR
> assignment Operator. To read more about that, check these two links out:
>
> https://msdn.microsoft.com/en-us/library/81bads72(v=vs.94).aspx
> http://web.eecs.umich.edu/~bartlett/jsops.html
> http://stackoverflow.com/a/14871137/5893008
>
> And that is really not the use case here. We don't want a bit-wise, we
> want a logical OR.
>
> So here is what I come up with. It's not rocket science but ... nah, it's
> pretty straight forward..
>
> `var listItem || = 'I love open source!'`
>
>
> For me, this is one thousand times more clean and it makes sense.
> JavaScript teaches us and wants us to use `+ =`,` - =` and any other type
> of "abbreviation" , so this makes perfectly sense for me. Either I'm crazy,
> but it seems like this should have been implemented a long time ago.
> ( Perhaps I'm both).
>
> Implementation will be another issue, but let us discuss that too( just
> keep in mind this is conceptional)
>
>
> Without further ado, I leave this up to you to discuss, and hopefully a
> champion to fetch up to the committee.
>
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