Simple Object with Array Example

sketch.js

var Ball = function() {
	this.x = mouseX;
	this.y = mouseY;
	this.diameter = 10;
}

var balls = [];



function setup() {
  createCanvas(windowWidth, windowHeight); 
}

function draw() {

  background(0);
  
  for (var i = 0; i < balls.length; i++) {
  	ellipse(balls[i].x, balls[i].y, balls[i].diameter, balls[i].diameter);
  }
}

function mousePressed() {
	balls.push( new Ball() );
}