Run results for: Formatting number, including NaN

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
✓ FormatNumber for NaN (both)	9,816,589 Ops/sec
NewFormatNumber	2,819,814 Ops/sec
OldFormatNumber	114,543 Ops/sec

Script Preparation code:

function newFormatNumber(value, decimals, decimalSeparator = ',', thousandsSeparator = '.', prefix = '', suffix = '') {
  		if (value === null || isNaN(value)) return value;
  
        let negative = value < 0 ? '-' : '';
        let absValue = Math.abs(value);
        let integerPart = Math.floor(absValue);
        let decimalPart = absValue - integerPart;
        let formattedIntegerPart = integerPart.toString().replace(/\B(?=(\d{3})+(?!\d))/g, thousandsSeparator);
        let formattedDecimalPart = decimalPart.toFixed(decimals).slice(2);
        
        return `${prefix}${negative}${formattedIntegerPart}${decimalSeparator}${formattedDecimalPart}${suffix}`;
    }
                                
 function oldFormatNumber(value, options = {}) {
        if (value === null || isNaN(value)) return value;

        let standardOptions = {
            minimumFractionDigits: (typeof options.minimumFractionDigits === "number" ? options.minimumFractionDigits : null )
                || (typeof options.fractionDigits === "number" ? options.fractionDigits : 2),
            maximumFractionDigits: (typeof options.maximumFractionDigits === "number" ? options.maximumFractionDigits : null )
                || (typeof options.fractionDigits === "number" ? options.fractionDigits : 2),
        }
        
        return (value * 1).toLocaleString('ro', standardOptions);
    }

Tests:

OldFormatNumber
let num = oldFormatNumber(-123456.7890123, {fractionDigits: 2});
NewFormatNumber
let num = newFormatNumber(-123456.7890123, 2, ',', '.', '', ' EUR');
FormatNumber for NaN (both)
let num = oldFormatNumber('abc', {fractionDigits: 2});

Run results for: Formatting number, including NaN

Formatting a float number

OldFormatNumber

NewFormatNumber

FormatNumber for NaN (both)