File difference module similar to the Linux command "comm"

[jfondren]

On Saturday, 11 September 2021 at 23:17:31 UTC, Vino wrote:
> Hi All,
>
>   May i know whether there is any module similar to  the Linux 
> command "comm" (finding difference between 2 files), if present 
> can you please guide me through link to the page nor do let me 
> know  if there is any other solution.
>
> Eg
> File1
> list1
> list2
> list3
> lsit5
>
> File2
> list1
> list3
> lsit6
>
> File1 : difference: list6
> File2 : difference: list2,list5
>
> From,
> Vino

Take a look at https://dlang.org/phobos/std_algorithm_setops.html

With these inputs:

```d
import std.string : strip, splitLines;
import std.algorithm : equal, setDifference;

string[] File1 = q"EOF
list1
list2
list3
list5
EOF".strip.splitLines;

string[] File2 = q"EOF
list1
list3
list6
EOF".strip.splitLines;

unittest {
     assert(["list2", "list5"].equal(File1.setDifference(File2)));
     assert(["list6"].equal(File2.setDifference(File1)));
}
```