true-math/src/helpers/sign.js

True Math - math library for numbers of arbitrary length

import {normalizeNumber} from "./helpers.js";

export function signUnsafe(num) {
	if (num[0] === '-') return -1;
	if (num === '0') return 0;

	return 1;
}

export default function sign(num) {
	return signUnsafe(normalizeNumber(num));
}