Survey on map/flatMap disambiguation

[Kevin Bourrillion]

Ouch.  That is pretty gnarly.  Did we realize that before we voted?



On Thu, Mar 14, 2013 at 10:04 AM, Brian Goetz <brian.goetz at oracle.com>wrote:

> The survey is closed, results are here:
>
> https://www.surveymonkey.com/**sr.aspx?sm=**9UyN8RRvMX8BnpTdd4rYgDlXU9uUVA
> **LNDjNn_2fY2e9_2fo_3d<https://www.surveymonkey.com/sr.aspx?sm=9UyN8RRvMX8BnpTdd4rYgDlXU9uUVALNDjNn_2fY2e9_2fo_3d>
>
> The sense of the EG was strongly in favor of disambiguating both map and
> flatMap; several argued that they liked the "less magic" aspect of it, and
> the explicitness of where we go from reference to primitive streams and
> back.
>
> This does create a possibility for performance bugs, where users do:
>
>   stuff.map(Foo::size).reduce(0, Integer::sum)
>
> instead of
>
>   stuff.mapToInt(Foo::size).**reduce(0, Integer::sum)
>
> Both will now compile, but the former will be boxed and the latter won't
> be.  The previous status quo saved users from themselves in this case.
>
> Will make the following changes:
>
>  Stream.map -> {map,mapTo{Int,Long,Double}}
>  Stream.flatMap -> {flatMap,flatMapTo{Int,Long,**Double}}
>  {Int,Long,Double}Stream.map -> map,mapToObj
>
>
>
> On 3/10/2013 7:51 PM, Brian Goetz wrote:
>
>> I've posted a survey for the EG at:
>>
>>    https://www.surveymonkey.com/**s/NT5DW7G<https://www.surveymonkey.com/s/NT5DW7G>
>>
>> where people can express their opinion on the issue of flatMap
>> disambiguation (see thread entitled "flatMap ambiguity").
>>
>> The password has been communicated directly to the EG; contact me if you
>> didn't get it.
>>
>> Usual survey rules: enter your name with your response, all results will
>> be made public after the survey closes.  I'll set a closing time of 6PM
>> PT Wednesday of this week.
>>
>


-- 
Kevin Bourrillion | Java Librarian | Google, Inc. | kevinb at google.com
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