Behavior of joining mapresults

[Christian Köstlin]

On 20.12.17 17:19, Stefan Koch wrote:
> On Wednesday, 20 December 2017 at 15:28:00 UTC, Christian Köstlin wrote:
>> When working with json data files, that we're a little bigger than
>> convenient I stumbled upon a strange behavior with joining of mapresults
>> (I understand that this is more or less flatmap).
>> I mapped inputfiles, to JSONValues, from which I took out some arrays,
>> whose content I wanted to join.
>> Although the joiner is at the end of the functional pipe, it led to
>> calling of the parsing code twice.
>> I tried to reduce the problem:
>>
>> [...]
> 
> you need to memorize I guess, map is lazy.
thats an idea, thank a lot, will give it a try ...