Run results for: roundDecimal() with Math.pow vs. Unary and toPrecision()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
roundDecimalPow()	2262455.5 Ops/sec
roundDecimalUnaryToPrecision()	2026722.4 Ops/sec
roundDecimalParseFloatToPrecision()	1703093.5 Ops/sec

Script Preparation code:

function roundDecimalPow(value, decimals) {
  const factor = Math.pow(10, decimals);
  return Math.round(value * factor) / factor;
}

function roundDecimalUnaryToPrecision(value, decimals) {
  return +value.toPrecision(decimals);
}

function roundDecimalParseFloatToPrecision(value, decimals) {
  return parseFloat(value.toPrecision(decimals));
}

Tests:

roundDecimalPow()
roundDecimalPow(Math.random(), 2)
roundDecimalUnaryToPrecision()
roundDecimalUnaryToPrecision(Math.random(), 2)
roundDecimalParseFloatToPrecision()
roundDecimalParseFloatToPrecision(Math.random(), 2)

Run results for: roundDecimal() with Math.pow vs. Unary and toPrecision()

roundDecimalPow()

roundDecimalUnaryToPrecision()

roundDecimalParseFloatToPrecision()