Run results for: checking 2 fun locale array creation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Original	1457358.9 Ops/sec
Improved one	1030006.0 Ops/sec

Script Preparation code:


var NumberFormatUtils = {
    format: (locale, number) => number.toString(),
    formatToParts: (locale, number) => [
        { type: 'decimal', value: '.' },
        { type: 'minusSign', value: '-' },
        { type: 'group', value: ',' }
    ]
};

var STANDARD_DIGITS = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', '-', ','];

var INDEX_DECIMAL = 10;
var INDEX_MINUS_SIGN = 11;
var INDEX_GROUP = 12;

var LOCALE_TEST = 'en-US'; // Example locale

Tests:

Original
const getLocaleDigitsOriginal = (locale) => { const localeDigits = [...STANDARD_DIGITS]; for (let i = 0; i <= 9; i++) { localeDigits[i] = NumberFormatUtils.format(locale, i); } NumberFormatUtils.formatToParts(locale, 1000000.5).forEach((part) => { switch (part.type) { case 'decimal': localeDigits[INDEX_DECIMAL] = part.value; break; case 'minusSign': localeDigits[INDEX_MINUS_SIGN] = part.value; break; case 'group': localeDigits[INDEX_GROUP] = part.value; break; default: break; } }); return localeDigits; }; getLocaleDigitsOriginal(LOCALE_TEST);
Improved one
const DIGITS = [INDEX_DECIMAL, INDEX_MINUS_SIGN, INDEX_GROUP]; const getLocaleDigitsOptimized = (locale) => { const localeDigits = []; // Set standard digits for (let i = 0; i <= 9; i++) { localeDigits[i] = NumberFormatUtils.format(locale, i); } // Set standard symbols (decimal, minus sign, group) DIGITS.forEach((index) => { localeDigits[index] = STANDARD_DIGITS[index]; }); // Update locale-specific symbols NumberFormatUtils.formatToParts(locale, 1000000.5).forEach((part) => { switch (part.type) { case 'decimal': localeDigits[INDEX_DECIMAL] = part.value; break; case 'minusSign': localeDigits[INDEX_MINUS_SIGN] = part.value; break; case 'group': localeDigits[INDEX_GROUP] = part.value; break; default: break; } }); return localeDigits; }; getLocaleDigitsOptimized(LOCALE_TEST);

Run results for: checking 2 fun locale array creation

Original

Improved one