Islam Ibakaev

$results = collect();
$itemsByMart->each(function ($item, $key) use ($customProductsByMart, $results) {
  $push = $customProductsByMart->has($key) ? $item->mergeRecursive($customProductsByMart->get($key)) : $item;
   $results[$key] = $push;
});
$customProductsByMart->each(function ($item, $key) use ($results) {
  if (!$results->has($key)) {
    $results[$key] = $item;
  }
});

function test(arr) {
  var obj = {}
  arr.forEach(el => {
    obj[el] = el
  })
  return obj
}

test([1, 2, 3, 4, 5]) // {1: 1, 2: 2, 3: 3, 4: 4, 5: 5}

// для главного (статического) списка
const parent = [{id: 1, text: 'top1'}, {id: 2, text: 'top2'}, {id: 3, text: 'top3'}]
// для зависимого (динамического) списка
const child =  [{1: { id: 1, text: 'child1-1', id: 2, text: 'child1-2', id: 3, text: 'child1-3' }}]

const selected = parent[0]

$('#parentSelect')
  .select2({ data: parent })
  .val(selected)
  .trigger("change")
  .on("change", (e) => $('#childSelect').empty().select2({ data: child[e.target.value] }));

$('#childSelect').select2({ data: child[selected.id] })

...
    <nav>
      <ul className='info-menu-list'>
        <li className='info-menu-item'>
          <NavLink to={this.props.match.path}>Валютный курс</NavLink>
        </li>
        <li className='info-menu-item'>
          <NavLink to={this.props.match.path + '/market'}>Валютный рынок</NavLink>
        </li>
        <li className='info-menu-item'>
          <NavLink to={this.props.match.path + '/rialto'}>Валютная биржа</NavLink>
        </li>
        <li className='info-menu-item'>
          <NavLink to={this.props.match.path + '/nbu'}>НБУ</NavLink>
        </li>
        <li className='info-menu-item'>
          <NavLink to={this.props.match.path + '/law'}>Закон</NavLink>
        </li>
      </ul>
    </nav>
...

...
<Switch>
  <Route exact path={this.props.match.path + '/market'} component={InfoMarket} />
  <Route exact path={this.props.match.path + '/rialto'} component={InfoRialto} />
  <Route exact path={this.props.match.path + '/nbu'} component={InfoNbu} />
  <Route exact path={this.props.match.path + '/law'} component={InfoLaw} />
  <Route exact path={this.props.match.path} component={InfoRates} />
</Switch>
...

volumes:
      - ./sessions:/var/cpanel/php/sessions/ea-php71