colorGame.js

var numSquares = 6;
var colors = [];
var pickedColor;

var squares = document.querySelectorAll(".square");
var messageDisplay = document.querySelector("#message");
var colorDisplay = document.getElementById("colorDisplay");
var h1 = document.querySelector("h1");
var resetButton = document.querySelector("#reset");
var modeButtons = document.querySelectorAll(".mode");

init();

function init() {
    setupModeButtons();
    setupSquares();
    reset();
}

function setupModeButtons() {
    for (var i = 0; i < modeButtons.length; i++) {
        modeButtons[i].addEventListener("click", function () {
            modeButtons[0].classList.remove("selected");
            modeButtons[1].classList.remove("selected");
            this.classList.add("selected");
            this.textContent === "Easy" ? numSquares = 3 : numSquares = 6;
            reset();
        })
    }
}

function setupSquares() {
    for (var i = 0; i < squares.length; i++) {
        squares[i].addEventListener("click", function () {
            // grab color of clicked square
            var clickedColor = this.style.backgroundColor;

            // compare color to pickedColor
            if (clickedColor === pickedColor) {
                messageDisplay.textContent = "Correct!";
                resetButton.textContent = "Play again?";
                changeColors(clickedColor);
                h1.style.backgroundColor = clickedColor;
            } else {
                this.style.backgroundColor = "#232323";
                messageDisplay.textContent = "Try again";
            }
        })
    }
}

function reset() {
    // generate all new colors
    colors = generateRandomColors(numSquares);
    // pick a new random color from array
    pickedColor = pickColor();
    // change colorDisplay to match picked Color
    colorDisplay.textContent = pickedColor;
    resetButton.textContent = "New colors";
    messageDisplay.textContent = "";
    // change colors of squares
    for (var i = 0; i < squares.length; i++) {
        if (colors[i]) {
            squares[i].style.display = "block";
            squares[i].style.backgroundColor = colors[i];
        } else {
            squares[i].style.display = "none";
        }
    }
    h1.style.backgroundColor = "steelblue";
}

resetButton.addEventListener("click", function () {
    reset();
});

function changeColors(color) {
    // loop through all squares
    for (var i = 0; i < squares.length; i++) {
        // change each color to match given color
        squares[i].style.backgroundColor = color;
    }
}

function pickColor() {
    var random = Math.floor(Math.random() * colors.length);

    return colors[random];
}

function generateRandomColors(num) {
    // make an array
    var arr = [];
    // repeat num times
    for (var i = 0; i < num; i++) {
        // get random color and push into arr
        arr.push(randomColor());
    }

    return arr;
}

function randomColor() {
    // pick a "red" from 0 to 255
    var red = Math.floor(Math.random() * 256);
    // pick a "red" from 0 to 255
    var green = Math.floor(Math.random() * 256);
    // pick a "red" from 0 to 255
    var blue = Math.floor(Math.random() * 256);

    return "rgb(" + red + ", " + green + ", " + blue + ")";
}