It’s good to know that there are ways to work around this in v17. I forgot to mention that I’m working in v16 where we don’t have collections or dot notation yet.
Jim > On Sep 30, 2018, at 8:22 PM, Keisuke Miyako via 4D_Tech > <[email protected]> wrote: > > Hello, > > it is important to understand that objects and collections are references, > and "bridge" commands such as OB GET ARRAY and OB SET ARRAY create deep > copies of the entity that is referenced. > > if, for example, you were to append an item to an object array that belongs > to an object, > OB GET ARRAY, APPEND TO (object) ARRAY, OB SET ARRAY would be extremely > inefficient. > > you must use object notation and collection methods for such operation. > > in fact, you should use object notation just once, to get a handle on the > property which is a collection of objects, > and work with that reference directly rather than dotting your way through to > the property each time. > > --- > > recently I have worked on a project with an object with thousands of > properties and tens of thousands of array elements, > but I had none of the performance issue you describe, because I always use > object notation and collection methods. > > we still need to convert typed collections to native arrays from time to time, > because popup menus or tab controls don't support collections. > but in the UI the number of elements are naturally limited. > > http://doc.4d.com/4Dv17/4D/17/COLLECTION-TO-ARRAY.301-3730912.en.html > http://doc.4d.com/4Dv17/4D/17/ARRAY-TO-COLLECTION.301-3730916.en.html > http://doc.4d.com/4Dv17/4D/17/Type-conversions-between-collections-and-4D-arrays.300-3730918.en.html > > now that we have C_COLLECTION and object notation, > I honestly think ARRAY OBJECT is totally wasted. > > 2018/10/01 9:46、Jim Crate via 4D_Tech > <[email protected]<mailto:[email protected]>>のメール: > TL;DR: don’t put object arrays of more than a couple hundred elements into an > object if you don’t like looking at the spinning wheel of death. And > definitely don’t expand an object property in the debugger that has an object > array of 800+ elements unless it’s time to break for multiple drinks. > > > ********************************************************************** > 4D Internet Users Group (4D iNUG) > Archive: http://lists.4d.com/archives.html > Options: https://lists.4d.com/mailman/options/4d_tech > Unsub: mailto:[email protected] > ********************************************************************** ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] **********************************************************************
