JavaScript: Collision detection

Here’s a very simple bounding rectangle routine. It expects both a and b to be objects with x, y, width and height properties:

function isCollide(a, b) {
    return !(
        ((a.y + a.height) < (b.y)) ||
        (a.y > (b.y + b.height)) ||
        ((a.x + a.width) < b.x) ||
        (a.x > (b.x + b.width))
    );
}

To see this function in action, here’s a codepen graciously made by @MixerOID.