how to limit double to 2 decimal places in dart code example

Example: double 2 decimal places flutter

/// Define an extension:
extension Ex on double {
  double toPrecision(int n) => double.parse(toStringAsFixed(n));
}

/// Usage:
void main() {
  double d = 2.3456789;
  double d1 = d.toPrecision(1); // 2.3
  double d2 = d.toPrecision(2); // 2.35
  double d3 = d.toPrecision(3); // 2.345
}