Benchmark: Intl.NumberFormat vs toLocalString vs string split & reduce (with fraction digits)

Script Preparation code:

function pricize (num, decimal = 0) {
  const intPart = Math.floor(num)
  const intPieces = intPart.toString().split('')
  const len = intPieces.length
  const intStr = intPieces.reduce((result, chr, index, array) => {
    const pos = len - index
    result += (index !== 0 && pos % 3 === 0) ? ',' + chr : chr
    return result
  }, '')

  const decStr = decimal > 0
    ? num.toFixed(decimal + 1).toString().slice(-(decimal + 2), -1) // toFixed() は四捨五入してしまうので(decimal + 1)桁まで求めて切り取る
    : ''

  return intStr + decStr
}

var target = 123456789.123456789
var options = {minimumFractionDigits: 3, maximumFractionDigits: 3}

Tests:

toLocaleString
var a = target.toLocaleString('en-US', options);
Intl.NumberFormat
var a = new Intl.NumberFormat('en-US', options).format(target)
string split & reduce
var a = pricize(target, 3)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLocaleString
Intl.NumberFormat
string split & reduce

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36

Browser/OS: Chrome 89 on Windows

View result in a separate tab

Test name	Executions per second
toLocaleString	39350.4 Ops/sec
Intl.NumberFormat	37414.6 Ops/sec
string split & reduce	1223718.0 Ops/sec

Intl.NumberFormat vs toLocalString vs string split & reduce (with fraction digits) (version: 0)

Comparing performance of: toLocaleString vs Intl.NumberFormat vs string split & reduce

Created: 3 years ago by: Guest

Jump to the latest result

toLocaleString

Intl.NumberFormat

string split & reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A