@js-data-tools/js-helpers/dist/esm/convert/numeric.js

A set of JavaScript / TypeScript helper functions for parsing, converting, transforming and formatting data.

const FACTORS = [1, 10, 100, 1000];
export function roundNumber(value, maxDecimalDigits = 2) {
    if (maxDecimalDigits < 0) {
        return value;
    }
    if (!maxDecimalDigits) {
        return Math.round(value);
    }
    const intPart = Math.trunc(value);
    const fraction = value - intPart;
    if (fraction === 0) {
        return intPart;
    }
    const factor = maxDecimalDigits < FACTORS.length ? FACTORS[maxDecimalDigits] : Math.pow(10, maxDecimalDigits);
    return intPart + Math.round(fraction * factor) / factor;
}
export function compactNumber(value, maxPower = 4, base = 1000) {
    let current = Math.abs(value);
    let power = 0;
    while (power < maxPower && current >= base) {
        current /= base;
        power++;
    }
    current = roundNumber(value < 0 ? -current : current, current < 100 ? 2 : current < base ? 1 : 0);
    return [current, power];
}