main.js

var numOfSquares = 6;
var colors = [];
var pickedColor;
var squares = document.querySelectorAll(".square");
var colorDisplay = document.querySelector("#colorDisplay");
var messageDisplay = document.querySelector("#message");
var h1 = document.querySelector("h1");
var resetButton = document.querySelector("#reset");
var modeButtons = document.querySelectorAll(".mode");


init();

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

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

function setupModeButtons(){
    //mode buttons event listeners
    for (let 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" ? numOfSquares = 3: numOfSquares = 6;
            reset();
        });
    }
}

function setupSquares(){
    for (let i = 0; i < squares.length; i++) {  
        //add click listeners to squares
        squares[i].addEventListener("click", function(){
            var clickedColor = this.style.background;
            if(clickedColor === pickedColor){
                messageDisplay.textContent = "Correct!";
                resetButton.textContent = "Play again"
                changeColor(pickedColor);
                h1.style.background = pickedColor;
            } else {
                this.style.background = "#232323";
                messageDisplay.textContent = "Try again!";
            }
        });
    }
}

function reset(){
    colors = generateRandomColors(numOfSquares);
    pickedColor = pickColor();
    colorDisplay.textContent = pickedColor;
    resetButton.textContent = "New colors";
    messageDisplay.textContent = "";
    for (let i = 0; i < squares.length; i++) {
        if(colors[i]){
            squares[i].style.display = "block";
            squares[i].style.background = colors[i];
        } else {
            squares[i].style.display = "none";
        }
    }
    h1.style.background = "steelblue";
}

function changeColor(color){
    for (let i = 0; i < squares.length; i++) {
        squares[i].style.background = color;
        
    }
}

function pickColor(){
    var random = Math.floor(Math.random() * colors.length);
    return colors[random];
}

function generateRandomColors(num){
    var arr = [];
    for (let i = 0; i < num; i++) {
        arr.push(randomColor());
    }
    return arr;
}

function randomColor(){
    var red = Math.floor(Math.random()*256);
    var green = Math.floor(Math.random()*256) ;
    var blue = Math.floor(Math.random()*256);
    return "rgb(" + red + ", " + green + ", " + blue + ")";
}