4 useful things
Format numbers as currency with proper symbols and formatting
function formatMoney(amount, currency = 'USD', locale = 'en-US') {
return new Intl.NumberFormat(locale, {
style: 'currency',
currency: currency,Convert bytes to human-readable file sizes
function formatFileSize(bytes, decimals = 2) {
if (bytes === 0) return '0 Bytes';
const k = 1024;Simple template engine for string interpolation
function template(string, data) {
return string.replace(/\$\{([^}]+)\}/g, (match, key) => {
const keys = key.trim().split('.');
let value = data;Working with dates, times, formatting, calculations, and timezone conversions.
# Current date and time
date
date '+%Y-%m-%d %H:%M:%S'