9/27 Questions:

function setup() {
 createCanvas(480, 120);
 noStroke();
}
function draw() {
 background(0);
 for (var y = 0; y < height+45; y += 40) {
   for (var x = 0; x < width+45; x += 40) 
 fill(255, 140);
 ellipse(0, y, 40, 40);
  ellipse(x, 0, 40, 40);
 }

//why don't these two codes result the same?

function setup() 
{ createCanvas(480, 120); 
noStroke(); }

 function draw() { 
background(0); 
for (var y = 0; y < height+45; y += 40) { 
fill(255, 140); ellipse(0, y, 40, 40); } 
for (var x = 0; x < width+45; x += 40) { 
fill(255, 140); 
ellipse(x, 0, 40, 40); } }

function setup() {
 createCanvas(480, 120);
}
function draw() {
 background(0);
 for (var y = 32; y <= height; y += 8) {
 for (var x = 12; x <= width; x += 15) 
 ellipse(x+y, y, 16 - y/10.0, 16 - y/10.0);
 }
}

//don't get the last line
//how can the circles shrink smaller as it gets to the bottom of the canvas

//what is the last two value of the map function

r=map(mouseX,0,600,0,255);
g=map(mouseX,0,600,0,200);
b=map(mouseY,0,600,255,0);

10/4 Questions:

background(random(100), 50, 100);
//what does the random(100) mean here

intersects(other) {
let d = dist(this.x, this.y, other.x, other.y);
return d < this.r + other.r;

//what does return mean?

contains(px, py) {
let d = dist(px, py, this.x, this.y);
if (d < this.r) {
return true;
} else {
return false;
}
}

//what does contains mean

//https://editor.p5js.org/codingtrain/sketches/OG-_2K16

let overlapping = false;
    for (let other of bubbles) {
      if (b !== other && b.intersects(other)) {
        overlapping = true;
      }
//make sure if b is intersecting every other bubble as long as b isn't checking itself
//https://editor.p5js.org/codingtrain/sketches/7SjPmXN2