Round padded

roundPadded.js

function roundPadded(n, d = 0) {
    const div = Math.pow(10, d)
    let res = (Math.round(n * div) / div).toString().split('.')
    const whole = res[0]
    if (d <= 0) {
        return whole
    }
    let dec = res[1] || ''
    if (d > 0 && dec.length < d) {
        dec += '0'.repeat(d - dec.length)
    }
    return whole + '.' + dec
}