odin-etch-a-sketch/script.js

const container = document.querySelector("#container");

function randomizeColor() {
    const hex = "0123456789abcdef";
    let output = "#";
    for (let i = 0; i < 6; i++) {
        output += hex[Math.floor(Math.random() * 16)];
    }
    return output;
}

function createGrid(size) {
    for (let i = 0; i < size; i++) {
        let flexbox = document.createElement("div");
        flexbox.classList.add("flexbox");
        for (let j = 0; j < size; j++) {
            let div = document.createElement('div');
            div.classList.add("block");
            flexbox.appendChild(div);
        }
        container.appendChild(flexbox);
    }
    
    let blocks = document.querySelectorAll(".block");
    blocks.forEach(block => {
        block.addEventListener("mouseover", (event) => {
            event.target.style.backgroundColor = randomizeColor();
        });
        // block.addEventListener("mouseout", (event) => {
        //     setTimeout(() => {
        //         event.target.style.backgroundColor = "#fff";
        //     }, 1 * 1000);
        // });
    })
}

createGrid(16);

function removeGrid() {
    document.querySelectorAll(".flexbox").forEach(flexbox => flexbox.remove());
    document.querySelectorAll(".block").forEach(block => block.remove());
}

function clearGrid() {
    document.querySelectorAll(".block").forEach(block => {
        block.style.backgroundColor = "#fff";
    });
}

document.querySelector("button#clear").addEventListener('click', clearGrid);

document.querySelector("button#gridsize").addEventListener('click', () => {
    let newGridSize = prompt("Provide new size of grid, provide one number, it will be processed as (VALUExVALUE - square grid):");
    if (!isNaN(newGridSize) && newGridSize != null && newGridSize != "") {
        removeGrid();
        createGrid(newGridSize);
    }
});