extendedArrayClass

class ExtendedArray extends Array
{
    constructor(separator = ':', tag = 'li',...args)
    {
        super(...args);
        this._separator = separator;
        this._tag = tag;
    }
    toString(separator = this._separator)
    {
        this._separator = separator;
        return this.join(this._separator);
    }
    toHtml(tag = this._tag)
    {
        this._tag = tag;
        let base = '';
        base = this.reduce((prev,it)=>{ return `${prev}<${this._tag}>${it}</${this._tag}>`;},base)
        base = this._tag = 'li' ? `<ul>${base}</ul>` : base;
        return base;
    }
    render()
    {
        document.write(this.toHtml());
    }
}