PHP Manual: Creates a new instance

public Ds\Set::__construct(mixed $values = [])

Creates a new instance, using either a traversable object or an array for the initial values.

Example #1 Ds\Set::__construct example

<?php
$set = new \Ds\Set();
var_dump($set);

$set = new \Ds\Set([1, 2, 3]);
var_dump($set);
?>

The above example will output something similar to:

object(Ds\Set)#1 (0) {
}
object(Ds\Set)#2 (3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}