MeasurementJs

Nice unit of measure conversion, featuring:

• Simplicity: an easy to-use, Behaviour driven API
• Sophistication: full test coverage from project day one
• Quality: aiming at high performance whilst maintaining a fair trade-off between accuracy
• Adaptability: Easy to extend for new measurement types (incl. i18n tables)

measurement('Temperature').convert(20)
    .from(measurement.Unit.Temperature.CELSIUS)
    .to(measurement.Unit.Temperature.FAHRENHEIT);        // returns 68

measurement('Distance').convert(1)
    .from(measurement.Unit.Distance.KILOMETRE)
    .to(measurement.Unit.Distance.METRE);                // returns 1000
    
measurement('Speed').convert(10)
    .from(measurement.Unit.Speed.KILOMETRE_PER_HOUR)
    .to(measurement.Unit.Speed.METRES_PER_SECOND);       // returns 36

Test-Driven Development

The API definition and all conversion operations are covered by jasmine tests. The test suite can be executed straightaway and easily, for example:

• Test directly in the browser Simply open test/index.html in the browser

• PhantomJs via Karma test driver npm run-script karma That command is just a shorthand for node_modules/.bin/karma start. If you have karma-cli already installed globally, you can also just do karma start. Karma will startup and run all tests on phantomjs

• Any Browser you like with Karma

  1. Set singleRun:false in ./karma.conf.js
  2. Start the Karma with npm run-script karma or npm test or ... (see above)
  3. navigate any browser you'd like to test to http://localhost:9876
  4. observe the output on the test console

Roadmap

For current and future state of affairs, have a peek at the Roadmap in the root project folder.

Get it

Currently you only need to download and include measurement.js in your project.

latest release - install via NPM:

In case the node package manager is part of your development stack, this may be more comfortable for you:

Currently tested platforms

Please feel free to add your own test results.

PhantomJS 1.9.7 (Linux): Executed 46 of 46 SUCCESS (0.027 secs / 0.022 secs)
Chrome 18.0.1025 (Linux): Executed 46 of 46 SUCCESS (0.06 secs / 0.035 secs)
Firefox 28.0.0 (Ubuntu): Executed 46 of 46 SUCCESS (0.037 secs / 0.026 secs)

Inspiring projects

• http://www.codeproject.com/Articles/23087/Measurement-Unit-Conversion-Library (a C# / XML based approach)
• http://momentjs.com/ (Beautiful & small code base, great simplistic API - role model for MeasurementJs)
• http://www.convert-me.com/en/convert/weight/ (all possible conversions one could think of already implemented in JS)