backward method

void backward()

Moves the Bar Backward

Implementation

void backward() {
  var out = StringBuffer('[');
  var width = Console.columns - 2;
  var before = width - position;
  var after = width - before - 1;
  for (var i = 1; i <= before; i++) {
    out.write(' ');
  }
  out.write('=');
  for (var i = 1; i <= after; i++) {
    out.write(' ');
  }
  out.write(']');
  Console.overwriteLine(out.toString());
}