Wanted: best way to express default expectations
Jesse Phillips
Jesse.K.Phillips+D at gmail.com
Mon Oct 14 15:26:03 UTC 2019
On Monday, 14 October 2019 at 13:00:14 UTC, Dukc wrote:
> On Saturday, 12 October 2019 at 16:48:56 UTC, Jesse Phillips
> wrote:
>>
>> Sorry forgot the foreach break part.
>>
>> import std.stdio;
>> void main()
>> {
>> import std.algorithm;
>> import std.range;
>>
>> foreach(i; iota(10)
>> .filter!(x => x%2)
>> .until!(x => x>5)
>> .map!"a * a"
>> .filter!(x => x%4)) {
>> i.writeln;
>> break;
>> }
>> }
>>
>> Note this is all done lazily so there is no walking of the
>> iota which happens.
>
> This is not exactly what I wanted, but probably the best
> alternative overall. At least it's better than in C#, as you
> don't sacrifice as much performance for using functional
> pipelines.
How is not what you want? I realize it doesn't use the same
foreach break structure, but then there is no alternative.
>
> But I still think an `if_not`, `ifnot` or some similar keyword
> would have it's place. Does anybody agree? Read: might it be
> worth a DIP?
I don't think it is worth it and I do think the range based
approach is direction people should head.
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