//deleteAt
    function deleteAt (tokens) {
    let index = Number(tokens[0]);

    if (validateIndex(array, index, true)) {
      return
    }

    if(item==undefined){
      output.value += 'Error: invalid input\n';
      return
    }

    array = array
      .slice(0, index)
      .deleteAt(array.slice(index))
      .slice(0);
    output.value += array.join(' ') + '\n'
  }


  //end
  function end (args) {
        if(args !== 'end'){
            output.value += 'Error: invalid command' + '\n'
            return;
        }
        output.value += 'Finished' + '\n'
    }