How to draw objects to canvas?

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So basically I want to make an object appear on a simple HTML canvas through the class GameObject and I can’t get it done. The code compiles fine but it just doesn’t appear on the screen. I assume it has to do with the variable ctx but I’m not too sure.

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");

square = new GameObject(20, 40, 50, 50, "blue");
square.drawObject();

class GameObject {
    constructor(x, y, w, h, color) {
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;
        this.color = color;
    }

     drawObject() {
        ctx.rect(this.x, this.y, this.w, this.h);
        ctx.fillStyle = this.color;
        ctx.fill();
    }
}
<style>
    * { padding: 0; margin: 0; }
    canvas { background: #eee; display: block; margin: 0 auto; }
</style>

<canvas id="myCanvas" width="480" height="320"></canvas>

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