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

A popular utility that lets you convert between different units: convert-units

Usage example, converting imperial inches to metric cm:

var convert = require('convert-units')
convert(1).from('in').to('cm') // 2.54 

To install:

npm install convert-units