Embed for Understanding Regular Function & Converting To Arrow Function Article - First project from 15 javascript project free course transcribed to arrow function

app.js

'use strict';

const hex = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 'B', 'C', 'D', 'E', 'F'];
const section1 = document.querySelector('.section1');
const btn = document.getElementById('btn');
const color = document.querySelector('.color');

let getRandomNumber = () => {
    return Math.floor(Math.random()*hex.length);
}

const changeColor = () => {
    let hexColor = '#';
    let i = 0;
    for (; i < 6; i++) {
        hexColor += hex[getRandomNumber()];
    }
    color.innerHTML = hexColor;
    color.style.color = hexColor;
    section1.style.backgroundColor = hexColor;
}

changeColor(); //on js file load

btn.addEventListener('click', changeColor); //on click