Dynamically update alpha in color()

p5.js Coding Questions
3

So I see I can set the alpha via setAlpha(), how would you get/check the current alpha?

...

this.a = 255;

if (this.col.alpha > 255) {  // <---?
 this.col.setAlpha(this.a +=13); // this.a is just bc i don't know how to get the alpha in order to update the value
}

live version to play with …