get multiple selected values in javascript from select tag code example

Example 1: how to get values from select multiple in js

document.getElementById('submit').onclick = function() {
  var selected = [];
  for (var option of document.getElementById('pets').options) {
    if (option.selected) {
      selected.push(option.value);
    }
  }
  alert(selected);
}

Example 2: html select multiple selected values

var values = $('#select-meal-type').val();