I have the following javascript es6 class (along with some functions) that generates an area where you can draw in a page.class Painter {    constructor(selector, cols, rows, style) {        this.looper = null;        if (!selector)            throw new TypeError(Provide a valid table selector);        this.cols = cols || 20;        this.rows = rows || 20;        this.selector = selector;        this.style = style;        let markup = ;        for (let height = 0; height < this.rows; height++) {            markup += <tr>;            for (let width = 0; width < this.cols; width++)                markup += <td data-col= + width +  data-row= + height + ></td>;            markup += </tr>;        }        $(function() {            $(selector).html(markup);            $(selector).on(click, td, function() {                $(this).toggleClass(tile-active);            });        });    }    setStyleSheet(stylesheet) {        this.style = stylesheet;    }    changeTileColor(stylesheet, newColor) {        if (!newColor)            return;        var css = .tile-active{\n\tbackground: + newColor + ;\n};        try {            changeCss((stylesheet || this.style), css);        } catch (e) {            console.log(Suppressed error);        }    }    createChessBoard() {        var id = this.selector;        $(function() {            $(id +  tr:nth-child(even) td:nth-child(even)).addClass(black-tile);            $(id +  tr:nth-child(odd) td:nth-child(odd)).addClass(grey-tile);        });    }    toggleBorder() {        var bname = $(this.selector).css(border);        $(this.selector).css(border, bname.indexOf(none) != -1 ? 2px solid : none);    }    clearBoard() {        $(this.selector +  .tile-active).removeClass(tile-active);    }    createRandowDraw() {        this.clearBoard();        let mat = $(this.selector +  td);        let max = mat.length;        for (let i = 0; i < max; i++) {            let num = Math.floor(Math.random(2) * 2);            if (num && num <= 1)                $(mat[i]).addClass(tile-active);        }    }}As I am new to classes in ECMAScript 6 I was wondering if there is anything I can do to improve the performance/readability of this code.Here is a link to the following code:Painter
ES6 class that generates an area where you can draw on a page
javascript;beginner;object oriented;ecmascript 6