Run results for: toFixed vs mathjs round

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Browser: Chrome 96

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
toFixed	1983398.4 Ops/sec
mathjs.round	333350.6 Ops/sec
round2	1043596.9 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjs/10.0.0/math.min.js'></script>

Script Preparation code:

var num = -6.864601706668172e-10

function round2(num, decimalPlaces = 0) {
    // return Math.round(value * (10 ** decimals)) / (10 ** decimals);
    // return Number(value.toFixed(decimals));
    if (num < 0) {
        return -round2(-num, decimalPlaces);
    }
    var p = Math.pow(10, decimalPlaces);
    var n = num * p;
    var f = n - Math.floor(n);
    var e = Number.EPSILON * n;

    // Determine whether this fraction is a midpoint value.
    return (f >= .5 - e) ? Math.ceil(n) / p : Math.floor(n) / p;
}

Tests:

toFixed
parseFloat(num.toFixed(8))
mathjs.round
math.round(num, 8)
round2
round2(num, 8)

Run results for: toFixed vs mathjs round

toFixed

mathjs.round

round2