JSFiddle - React, Tailwind, and code Playground

HTML

<div id='result'></div>

JavaScript

var val = 10;

function moneyRound(flt){
    var splitStr = flt.toString().split('.'),
        whole = (flt * 100) | 0;
    
    if (splitStr.length > 1  && splitStr[1].length > 2){
        return splitStr[1][2] > 4? (whole + 1) / 100: whole / 100;
    } else {
        return flt;   
    }
}
    
$('result').set('html', moneyRound(val));