Run results for: Ways to cache Intl.NumberFormat

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 Edg/134.0.0.0

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

static global instance

854K/s

Custom cache with maps

812K/s

Custom cache with objects

708K/s

Lodash cache

506K/s

Always new instance

23K/s

View exact numbers

Test name	Executions per second
✓ static global instance	853,767 Ops/sec
Custom cache with maps	811,704 Ops/sec
Custom cache with objects	707,905 Ops/sec
Lodash cache	505,681 Ops/sec
Always new instance	22,600 Ops/sec

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js'></script>

Script Preparation code:

const formatOptions = {
  minimumFractionDigits: 0,
  maximumFractionDigits: 0,
  useGrouping: false,
  style: 'percent',
};

const staticInstanceDe = new Intl.NumberFormat("de", formatOptions);
const staticInstanceFr = new Intl.NumberFormat("fr", formatOptions);

const lodashCache = _.memoize(
    (locale, options) => new Intl.NumberFormat(locale, options),
    (locale, options) => `${locale}-${JSON.stringify(options)}`,
);

const mapCache = new Map();
const getMapCacheInstance = (locale, options) => {
  let lang;
  if (!mapCache.has(locale)) {
    lang = new Map();
    mapCache.set(locale, lang);
  } else {
    lang = mapCache.get(locale);
  }
  if (!lang.has(options)) {
    const newInstance = new Intl.NumberFormat(locale, options);
    lang.set(options, newInstance);
    return newInstance;
  }
  return lang.get(options);
}

const objCache = {};
const getObjCacheInstance = (locale, options) => {
  let lang = objCache[locale];
  if (!lang) {
    lang = {};
    objCache[locale] = lang;
  }
  if (!lang[options]) {
    const newInstance = new Intl.NumberFormat(locale, options);
    lang[options] = newInstance;
    return newInstance;
  }
  return lang[options];
}

Tests: