old-money

💷 JS/TS module for Pounds, Shillings, and Pence (lsd/£sd)

old-money uses ECMAScript Modules so you'll need Node 14+

Install + Build

Built with esbuild

npm i
npm run watch

or npm run build

Test

Tests use ava.

npm test

Usage

import { lsd } from 'old-money'

let money = new lsd(959);
console.log(money.toString());
console.log(money.pounds, money.shillings, money.pence);

API

new lsd(pence)

Create a new lsd money object with a total number of pence:

let m = new lsd(6);

new lsd(pounds, shillings, pence)

Create a new lsd money object using three "stacks" of coin types. These will be converted into a total number of pence and rationalised:

let m = new lsd(1, 41, 25);
console.log(m.totalPence);
// 757
console.log(m.pounds, m.shillings, m.pence);
// 3, 3, 1	

lsd.toString()

Get the money amount as a string in the default format like "£3/19/11"

let m = new lsd(959);
console.log(m.toString());
// "£3/19/11"

lsd.toString(format)

Format your own string using $l, $s, and $d for pounds, shillings, and pence respectively.

let m = new lsd(522);
console.log(m.toString("£$l. $ss. $dd."));
// "£2. 3s. 6d."
console.log(m.toString("$l pounds, $s and $d"));
// "2 pounds, 3 and 6"

lsd.pounds, lsd.shillings, and lsd.pence

Get the individual, bounded number of pounds, shillings, and pence, with an upper bound on shillings (20) and pence (12):

let m = new lsd(959);
console.log(m.pounds, m.shillings, m.pence);
// 3, 19, 11

lsd.totalPence

Get the whole amount as a total number of pence:

let m = new lsd(959);
console.log(m.totalPence);
// 959

lsd.totalShillings

Get the whole amount as a total whole number of shillings, as some shops did:

let m = new lsd(1176);
console.log(m.totalShillings);
// 98

lsd.addPounds(pounds), lsd.addShillings(shillings), and lsd.addPence(pence)

Add the specified number of pounds, shillings, or pence. Pence can be greater than 12 and shillings greater than 20 because the amount will be rationalised into a whole number of pence:

let m = new lsd(12); //12d (one shilling)
m.addShillings(19); // Adds up to 20s, that is, £1

console.log(m.toString());
// "£1/0/0"

lsd.add(lsd)

Add together two lsd objects:

let m = new lsd(1,2,6);
let n = new lsd(0,2,6);
m.add(n);

console.log(m.toString());
// "£1/5/0"
// n is unchanged