Implementation
Pascal

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
import java.util.HashSet;
import java.util.List;
import java.util.Set;
Set<T> uniques = new HashSet<>(x);
x.clear();
x.addAll(uniques);
import java.util.HashSet;
import java.util.ArrayList;
x = new ArrayList<T>(new HashSet<T>(x));
y := make(map[T]struct{}, len(x))
for _, v := range x {
	y[v] = struct{}{}
}
x2 := make([]T, 0, len(y))
for _, v := range x {
	if _, ok := y[v]; ok {
		x2 = append(x2, v)
		delete(y, v)
	}
}
x = x2
import std.algorithm;
import std.array;
x = x.sort.uniq.array;
import std.container;
import std.array;
x = redBlackTree(x)[].array;
x = list(set(x))
import Data.List (sort)
nub (sort x)
using System.Collections.Generic;
using System.Linq;
var uniques = x.Distinct().ToList();
$x = array_unique($x);
x.uniq!
use List::MoreUtils 'uniq';
@x = uniq(@x);
x.sort();
x.dedup();
import java.util.HashSet;
import java.util.Iterator;
final HashSet<T> seen = new HashSet<T>();
final Iterator<T> listIt = x.iterator();
while (listIt.hasNext()) {
  final T curr = listIt.next();
  if (seen.contains(curr)) {
    listIt.remove();
  } else {
    seen.add(curr);
  }
}
seen := make(map[T]bool)
j := 0
for _, v := range x {
	if !seen[v] {
		x[j] = v
		j++
		seen[v] = true
	}
}
x = x[:j]
seen := make(map[T]bool)
j := 0
for _, v := range x {
	if !seen[v] {
		x[j] = v
		j++
		seen[v] = true
	}
}
for i := j; i < len(x); i++ {
	x[i] = nil
}
x = x[:j]
x = [...new Set(x)];
x = Array.from(new Set(x));
const seen = new Set();
x = x.filter( v => {
  if(seen.has(v))
    return false;
  seen.add(v);
  return true;
});
x = x.distinct
Enum.uniq([1,26,3,40,5,6,6,7])