Small class to generate points on a bezier curve

bezier.js

class BezierCurve {
    static quadratic(x0, y0, x1, y1, x2, y2, steps) {

        const points = [];

        for (let step = 0; step <= steps; step++) {
            const t = step / steps;

            const [lx0, ly0] = interp(x0, y0, x1, y1, t);
            const [lx1, ly1] = interp(x1, y1, x2, y2, t);

            const [qx0, qy0] = interp(lx0, ly0, lx1, ly1, t);

            points.push([qx0, qy0]);
        }

        return points;
    }
    static q_quadratic(x0, y0, x1, y1, x2, y2, steps) {

        const points = [];

        for (let step = 0; step <= steps; step++) {
            const t = step / steps;
            const t_sq = t * t;

            points.push([x0 * (1 - (2 * t) + t_sq) + x1 * (2 * (t - t_sq)) + x2 * t_sq, y0 * (1 - (2 * t) + t_sq) + y1 * (2 * (t - t_sq)) + y2 * t_sq]);
        }

        return points;
    }
    static q_cubic(x0, y0, x1, y1, x2, y2, x3, y3, steps) {

        const points = [];

        for (let step = 0; step <= steps; step++) {
            const t = step / steps;
            const t_sq = t * t;
            const t_cb = t_sq * t;
            points.push([x0 * (-t_cb + 3 * t_sq - 3 * t + 1) + x1 * (3 * t_cb - 6 * t_sq + 3 * t) + x2 * (-3 * t_cb + 3 * t_sq) + x3 * t_cb, y0 * (-t_cb + 3 * t_sq - 3 * t + 1) + y1 * (3 * t_cb - 6 * t_sq + 3 * t) + y2 * (-3 * t_cb + 3 * t_sq) + y3 * t_cb]);
        }

        return points
    }
    static cubic(x0, y0, x1, y1, x2, y2, x3, y3, steps) {

        const points = [];

        for (let step = 0; step <= steps; step++) {
            const t = step / steps;

            const [lx0, ly0] = interp(x0, y0, x1, y1, t);
            const [lx1, ly1] = interp(x1, y1, x2, y2, t);
            const [lx2, ly2] = interp(x2, y2, x3, y3, t);


            const [qx0, qy0] = interp(lx0, ly0, lx1, ly1, t);
            const [qx1, qy1] = interp(lx1, ly1, lx2, ly2, t);


            const [zx0, zy0] = interp(qx0, qy0, qx1, qy1, t);

            points.push([zx0, zy0]);
        }

        return points
    }

}

q_cubic is around 2.7x the speed of cubic
q_quadratic is around 1.7x the speed of quadratic