Павел Новиков

route -p add 192.168.1.0 mask 255.255.255.0 192.168.0.99

function addNew(arr, newObj) {
  if (!($.grep(arr, function(n, i) { return n.lat == newObj.lat && n.lng == newObj.lng; })).length)
   arr.push(newObj);
}

const arr = [
  {lat: 52.289591, lng: 21.030541},
  {lat: 52.289591, lng: 21.030541},
  {lat: 51.09464, lng: 17.019549},
];

const uniq = arr.filter(
  (el, i, array) => !array
    .slice(0, i)
    .find(({lat, lng}) => lat === el.lat && lng === el.lng)
);

const result = arr.filter((n, i, a) => n === a.find(m => m.lat === n.lat && m.lng === n.lng));

const result = Object.values(arr.reduce((acc, n) => (acc[`${n.lat},${n.lng}`] = n, acc), {}));

const result = [].concat(...Object
  .values(arr.reduce((acc, n) => ((acc[n.lat] = acc[n.lat] || {})[n.lng] = n, acc), {}))
  .map(Object.values)
);

const result = Array.from(new Set(arr.map(JSON.stringify)), JSON.parse);

const unique = (arr, keys) =>
  arr.filter((n, i, a) => i === a.findIndex(m => keys.every(k => n[k] === m[k])));


const result = unique(arr, [ 'lat', 'lng' ]);

page_item:
    path: /{parameters}
    defaults: { _controller: AppBundle\Controller\Page\PageController:itemAction }
    requirements:
        parameters: ".+"

public function itemAction(Request $request, $parameters)
{
    $parts = explode('/', $parameters);
    // ...
}