Browse table by jQuery

I need to go through a table to see if an element already exists in the first column.

Table:

<table id="tabela-resultado" class="table table-bordered table-striped table-hover">
  <thead>
    <tr>
      <th>Nome</th>
      <th>Ativo</th>
      <th class="text-center">Ação</th>
    </tr>
  </thead>
  <tbody>

    <?php if(count($records)) { ?>
    <?php foreach($records as $record) { ?>

    <tr data-id="<?php echo $record->id; ?>">
      <td>
        <?php echo $record->nome; ?>
      </td>
      <td>
        <?php 
        if ($record->ativo == 1) {
            echo "SIM"; 
        } else if($record->ativo == 0){
            echo "NÂO"; 
        }
        ?>
      </td>
      <td>
        <?php echo anchor("gurpoProduto/excluir", "<i class='glyphicon glyphicon-trash'></i> Exlcuir", ['class' => 'btn btn-danger btn-block', 'name' => 'delete']); ?>
      </td>
    </tr>

    <?php
    }
    }
    ?>
  </tbody>
</table>

What I've tried:

function verificar_existencia(nome) {

  var table = $("#tabela-resultado table tbody");
  var nomeTabela = '';

  table.find('tr').each(function(nome) {
    var $tds = $(this).find('td'),
      nomeTabela = $tds.eq(0).text()


  });

  if (trim(nome.toUpperCase()) === trim(nomeTabela.toUpperCase())) {

    toastr.success("Este grupo já existe!", "Aviso");
    //return false; 
  }
}

When I call the function verifica_existencia(nome) , it does not return me toastr.success("Este grupo já existe!", "Aviso"); when I insert an element that already exists.