locutus/esm/python/calendar/leapdays.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { countLeapYearsBetween, normalizeCalendarYear } from "../_helpers/_calendar.js";
export function leapdays(y1, y2) {
    //      discuss at: https://locutus.io/python/calendar/leapdays/
    // parity verified: Python 3.12
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //       example 1: leapdays(2000, 2021)
    //       returns 1: 6
    if (arguments.length === 0) {
        throw new TypeError("leapdays() missing 2 required positional arguments: 'y1' and 'y2'");
    }
    if (arguments.length === 1) {
        throw new TypeError("leapdays() missing 1 required positional argument: 'y2'");
    }
    return countLeapYearsBetween(normalizeCalendarYear(y1, 'leapdays'), normalizeCalendarYear(y2, 'leapdays'));
}