How do you round a double in Dart to a given degree of precision AFTER the decimal point?

Question

Given a double, I want to round it to a given number of points of precision after the decimal point, similar to PHP\'s round() function.

The closest thing I

Answer 1

The modified answer of @andyw using Dart Extension methods:

extension Precision on double {
    double toPrecision(int fractionDigits) {
        double mod = pow(10, fractionDigits.toDouble());
        return ((this * mod).round().toDouble() / mod);
    }
}

Usage:

var latitude = 1.123456;
var latitudeWithFixedPrecision = latitude.toPrecision(3); // Outputs: 1.123