Why ball doesn't change color?

Question

I need when ball hit wall, will change color
let canvas = document.getElementById("myCanvas");
let ctx = canvas.getContext("2d");
let ballRadius = 10;
let x = canvas.width/2;
let y = canvas.height-30;
let dx = 2;
let dy = -2;

function changeColor() {
let colors = ['red', 'blue', 'purple', 'green', 'pink']
let randomIndex = Math.floor(Math.random() * colors.length);
let randomColor = colors[randomIndex];
}

function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI*2);
ctx.fillStyle = "purple";
ctx.fill();
ctx.closePath();
}

function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBall();

if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
dx = -dx;
changeColor();
}

if(y + dy > canvas.height-ballRadius || y + dy < ballRadius) {
dy = -dy;
changeColor();
}

x += dx;
y += dy;
}

setInterval(draw, 10);

Answer 1

First of all remember to write your code in the playground and share here.
Second, check this and read comments:
https://sololearn.com/compiler-playground/W1Xicwbqx5KW/?ref=app

Answer 2

Thank you