Arbitrary-length decimal implementation using JavaScript's native BigInt with no dependencies.

• Supported on Node >= 10.4 and Deno.
• Check caniuse.com for browser support.

• Deno module first. Soon to be available as ES Module (ESM) and CommonJS (Node) module.

• Compute methods are largely implemented through native BigInt, without much string manipulation required.

• Standalone & lightweight. Zero dependencies.

• Intuitive data structure – base amount and decimal places, similar to that of cryptocurrency esp. Bitcoin.

• API is similar with the popular BigNumber libraries such as bignumber.js, big.js, decimal.js. Not all methods are supported, yet.

import { BigDenary } from "https://deno.land/x/bigdenary/mod.ts";

const bd = new BigDenary("123.4512");
const sum = bd.add(56.1e2);

console.log(sum.toString()); // 5733.4512
console.log(sum); // BigDenary { base: 57334512n, _decimals: 4 }

API is largely inspired by and attempts to be compatible with decimal.js-light.

• constructor(): supports type BDNumberInput = number | string | bigint | BigDenary | BigDenaryRaw.
• toString(): Returns string representation
• valueOf(): Returns number approximation
• toFixed(digits?): Returns string representation to the number of digits to appear decimal point.

• plus() or add()
• minus() or sub()
• multipliedBy() or mul()
• dividedBy() or div()
• negated() or neg()
• absoluteValue() or abs()

• comparedTo() or cmp()
• equals() or eq()
• greaterThan() or gt()
• greaterThanOrEqualTo() or gte()
• lessThan() or lt()
• lessThanOrEqualTo() or lte()

1. Install Deno

2. Run unit tests

deno test

JavaScript native decimal support is currently being proposed (Stage 1) to ECMA.

MIT · U-Zyn Chua

Contributions are welcomed.