Cached Intl.DateTimeFormat

.ts

const formatter = new Intl.DateTimeFormat('en-US', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit'
});

function format(date: Date) {
    const mapParts = Object.create(null);
    const parts = formatter.formatToParts(date);

    for (const {type, value} of parts) {
        mapParts[type] = value;
    }

    return `${mapParts.year}-${mapParts.month}-${mapParts.day} ${mapParts.hour}:${mapParts.minute}`;
}

const date = new Date();
const start = new Date();
for (let i = 0; i < 100000; i++) {
    format(date);
}
const end = new Date();

console.log(format(date));
console.log(end.getTime() - start.getTime());