Run results for: decimal.js versus native precision

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36

Browser: Chrome 93

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Decimal.js	62645.3 Ops/sec
Native	1897889.0 Ops/sec

HTML Preparation code:


  <script>
/* decimal.js v10.2.0 https://github.com/MikeMcl/decimal.js/LICENCE */
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  </script>

Script Preparation code:

function roundCase(num, prec)
{
    const roundDec = Decimal.clone({ precision: prec+1, rounding: prec});
    return roundDec(num).toDecimalPlaces(prec).toNumber();
}

function roundLogan(num, prec) {
  return Number(Math.round(num+'e'+prec)+'e-'+prec);
}

Tests:

Decimal.js
const answer = roundCase(1.005,2);
Native
const answer = roundLogan(1.005,2);

Run results for: decimal.js versus native precision

Let's see what happens.

Decimal.js

Native