clone recursive array

gistfile1.txt

Array.prototype.clone = function clone<T>(this: Array<T>, deep: boolean, parent: T = null): T[] {
    const c = this.map(x => Object.assign(Object.create(x as Object), x));
    const classNameMatch = (a, b) => a.constructor && b.constructor && a.constructor.name === b.constructor.name;

    if (deep) {
        c.forEach(i => {
            const keys = Object.keys(i);
            keys.forEach(k => {
                if (i[k] instanceof Array) {
                    // an array property, let's see if it's an array of T
                    i[k] = i[k].clone(deep, i[k].length > 0 && classNameMatch(i[k][0], i) ? i : parent);
                } else if (i[k] && classNameMatch(i[k], i)) {
                    i[k] = parent;
                } else if (i[k] instanceof Object) {
                    i[k] = Object.assign({}, i[k]);
                }
            });
        });
    }
    return c;
};