On Friday, 29 January 2016 at 08:06:14 UTC, glathoud wrote:
Thanks. I am glad be wrong on that one.
I had a look at map & filter in the source code ; pleased to
see they're lazily implemented!
map
https://github.com/D-Programming-Language/phobos/blob/master/std/algorithm/iteration.d#L425
filter
https://github.com/D-Programming-Language/phobos/blob/master/std/algorithm/iteration.d#L924
I had to look for FilterResult!
https://github.com/D-Programming-Language/phobos/blob/master/std/algorithm/iteration.d#L979
Small remark: One could make the laziness of filter a bit more
clear in the doc though - at least for newbies like me.
http://dlang.org/phobos/std_algorithm_iteration.html
Best regards,
Guillaume
While it's not entirely true because one can implement a non-lazy
range, any time you see the word "range" in the documentation you
should think that it is lazy. Ranges are an important concept in
D so we usually don't bother explaining it in the doc. You can
read about it here if you need to:
http://ddili.org/ders/d.en/ranges.html and
http://dlang.org/phobos/std_range.html
