Unit of Measure Conversion Library

Question

What is the best/most elegant way to abstract out the conversion of units of measures in the client, based on a user-preferred unit of measure setting?

For example,

Answer 1

The library "measure" converts between unit types (volume, mass, etc.) and supports multiple unit systems (US, Imperial, Metric)

// volume
measure('1 teaspoon').teaspoons() // 1
measure('1 1/2 tsp.').teaspoons() // 1.5
measure('2 cups and 1 pint').quarts() // 1

// mass
measure('1 pound').ounces() // 16
measure('1 1/2 oz.').ounces() // 1.5

// operations
measure('1 teaspoon').add('1 teaspoon').teaspoons();
measure('6 1/2 teaspoon').divide(2).teaspoons(); // 3.25

https://github.com/dubbs/measure