Hi Eliot,
Take a look at map:entry and map:merge[1]
let $map:=map{"a":"old","x":43}
let $seq:=("a","b") return map:merge(($map, for $item in $seq return map:entry($item,"somevalue") ))
/Andy [1] http://docs.basex.org/wiki/Map_Module#map:entry
On 18 April 2015 at 17:20, Eliot Kimber ekimber@contrext.com wrote:
I think I'm missing something fundamental but I haven't been able to find a relevant example of what I'm trying to do. I suspect I'm being derailed by procedural brain damage.
I have a function that takes as input a map and will return a new map reflecting updates applied to input map.
The business logic of this function is to iterate over some sequence and add or update map items as needed, e.g.:
let $map := map { } for $key in ('A', 'B') return map:put($map, 'A', 'somevalue')
The problem is that each interation of the for loop returns a new map.
In the context of a FLOWR expression I'm not seeing how to effectively update the same map instance.
What fundamental aspect of map manipulation am I missing?
Thanks,
Eliot ————— Eliot Kimber, Owner Contrext, LLC http://contrext.com