function task15() {
  var number = [5, 7, 4, 8, 3, 0];

  function filterRange(arr, a, b) {
    var result = [];

    arr.forEach(function(item) {
     if(item >= a && item <= b) {
      result.push(item);
     }
    });

    return result;
  }

  var filtered = filterRange(number, 9, 10);

  console.log(filtered);
  console.log(number);
}