js-custom-datepicker/src/js/lib/helper.js

Сalendar was written on javascript using es6 format and was redone to es5 using webpack and babel tools. There are many classes for easy styling for the desired website design.

'use strict';

export const clone = obj => {
    if (!obj) {
        return null;
    } else if (obj.constructor === Array) {
        return obj.map(clone);
    } else if (typeof obj === 'object') {
        let result = {};
        for (var key in obj) {
            result[key] = clone(obj[key]);
        }
        return result;
    } else {
        return obj;
    }
};

export const extend = (original, source) => {
    var result = clone(original);
    for (let key in source) {
        result[key] = clone(source[key]);
    }
    return result;
};

export const browser = {
    addEventListener: !!window.addEventListener,
    touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof window.DocumentTouch
};