Visionary Software Solutions Measurement API: fluent, joyful measurement...FOR SCIENCE!

Meant to fight the odious practice witnessed in many code bases of using only integers/doubles for measurements/units and "knowing contextually" that a number corresponds to a measurement in kilograms... (which may be converted in the body of a method).

The goal of this API is to enable code written about measurements to be clear, expressive, and straightforward to reason about and understand by baking behaviors (such as well known conversion factors and arithmetic) directly into types.

Features

Builds on me_sure_meant, providing support for Mass.
SI and Imperial units
Fluent definition, unit conversion, and addition/subtraction.
Uncertainty in measurement with propagation through calculations.
Framework pieces to easily extend and evolve, replacing implementations or adding new features
Full SI prefix support for all your yottagram and quectogram needs
Extension Methods to make defining a quantity as easy as writing (20.kilograms() - 32.pounds()).toUnit(Gram.milligram)

First Class (No, really, they're dedicated classes!) support for measurements of Mass

- SI: Kilogram (as `Grams`)
- Imperial: `Ounces`, `Pounds`, `Stones`, `Tons` (Long)

Also note that the package is built using Best Practice software engineering principles. The code is meant to be as SOLID as possible (thanks Uncle Bob!) with Stable Abstractions that work interchangeably (don't like Crude or BasicUncertainty Measurements? Roll your own!). DECORATOR for SI MetricPrefix was an obviously nice win I'm surprised I haven't seen done more. The library has test coverage and planned seams for modularization once the basics are proven out.

Getting started

Dependency: me_sure_meant library. This package is "platform"/foundational. It should work in any Dart 3+ runtime environment.

Usage

Check out the demos in example/massive_example.dart

Here's a teaser

final kilograms = 89.99998368592.kilograms();
198.416.pounds().toUnit(Gram.kilogram);
areEqual(kilograms, 198.416.pounds());
final picograms = kilograms.toUnit(Gram.picogram);
/// the library supports comparisons using compareTo and natural operators
assert(1.grams() < picograms);
assert(100.kilograms().compareTo(picograms) > 0);

Additional information

This package is Free and Open Source Software by Visionary Software Solutions. Alternative licensing is available, on a sliding scale case-by-case basis. (Contact nico at visionary.software)