Missing array element

[Biotronic via Digitalmars-d-learn]

On Wednesday, 30 August 2017 at 06:16:16 UTC, Vino.B wrote:
> On Tuesday, 29 August 2017 at 18:39:03 UTC, Ali Çehreli wrote:
>> https://dlang.org/phobos/std_algorithm_setops.html#.setDifference


>  I tried the setDifference but does seem to be working as 
> expected

 From the documentation of setDifference: "The two ranges are 
assumed to be sorted by less."

In other words, you will need to sort your ranges first. Either 
pre-sort them as

     string[] a = ["test1", "test2", "test3", "test4"];
     string[] b = ["test2", "test4"]';

or call setDifference(a.sort(), b.sort()).

--
   Biotronic