Reducing an array

[MattCoder via Digitalmars-d-learn]

On Friday, 18 April 2014 at 20:02:41 UTC, Tim Holzschuh via 
Digitalmars-d-learn wrote:
> Hi there,
>
> I try to remove all equal elements of an array, thus [2,2] --> 
> [2].
>
> I thought this maybe would be possible with 
> std.algorithm.reduce, but at least the way I tried it doesn't 
> work:
>
> arr.reduce( (a,b) => a != b );
>
> Is there a simple solution using Phobos-functions?

Not too fancy, since I'm new in D, but I created this:

import std.stdio;
import std.array;
import std.algorithm;

static if (!is(typeof(writeln)))
	alias writefln writeln;

void main(){
	int myfilter(int a){
		static int[] b;
		if(b.find(a) == []){
			b.insertInPlace(b.length, a);
			return a;
		}
		return -1;
	}
	
	auto arr = [1,1,2,3,2,2,4,5,5,1];	
	auto arrFiltered = arr.filter!(a => myfilter(a) > 0);
	
	writeln(arrFiltered);
}

Tested: http://dpaste.dzfl.pl/97a1307c7fec

I'm looking for creating something like C# "extensions", maybe 
with alias. I'll try later!

Matheus.