Prerequisites

You'll need to have the following software installed:

• nodeJS
• npm

Installation

The latest version is always available on NPM

> npm install isq

The big.js package is recommended for arbitrary-precision decimal arithmetic.

> npm install big.js

Usage

Get the packages

> node
isq = require('isq')
isq.config.Number = require('big.js')

Determine the length of a line when the starting and ending points are uncertain.

let a = isq('1.2(2) cm'),       // 1.2±0.2 cm
    b = isq('1.3(3) cm'),       // 1.3±0.3 cm
    length = a.plus(b);         // 2.5±0.4 cm

Convert to another unit

let speed = isq('25 m/s'),      // 25 m s⁻¹
    kph = speed.to('km/h');     // 90