On Thursday, 1 January 2026 at 19:30:11 UTC, zhade wrote: > > auto list = someExpensiveOperation(); > > return list > .filter!filterFunc > .map!mapFunc; > } oh your looking to mutate the data Consider my mutmap here if expensive operation is element by element: https://forum.dlang.org/post/urwssqgafegghncksyio@forum.dlang.org