script.js

//variables and selectors
var numSquares = 6;
var colors = [];
var pickedColor;
var squares = document.querySelectorAll(".square");
var colorDisplay = document.getElementById("colorDisplay");
var messageDisplay = document.querySelector("#message");
var h1 = document.querySelector("h1");
var resetButton = document.getElementById("reset");
var modeButtons = document.querySelectorAll(".mode");

init();

function init(){
    //mode buttons event listeners
    setupModeButtons();
    setupSquares();
    reset();
}

function setupModeButtons(){
    //mode buttons event listeners
    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++){
        //add click listeners to squares
        squares[i].addEventListener("click", function(){
            //grab color of clicked square
            var clickedColor = this.style.backgroundColor;
            //compare color to picked color
            if(clickedColor === pickedColor){
                messageDisplay.textContent = "Correct!";
                resetButton.textContent = "Play Again?";
                h1.style.backgroundColor = pickedColor;
                changeColors(clickedColor);
            } else {
                this.style.background = "#232323";
                messageDisplay.textContent = "Try Again";
            }
        })
    }
}

function reset(){
    // generate all new colors
    colors = generateRandomColors(numSquares);
    // pick a new random color from array
    pickedColor = pickColor();
    //change color display
    colorDisplay.textContent = pickedColor;
    // message display goes back to "New colors" after clicking play again
    resetButton.textContent = "New Colors";
    //change message display to not display play again when user clicks play again
    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 array
    var arr = [];
    //add num random colors to array
    for(var i = 0; i < num; i++){
        //get random color and push into array
        arr.push(randomColor());
    }
    //return array
    return arr;
}

function randomColor(){
    //Pick a "red" from 0 - 255
    var r = Math.floor(Math.random() * 256);
    //Pick a "green" from 0 - 255
    var g = Math.floor(Math.random() * 256);
    //Pick a "blue" from 0 - 255
    var b = Math.floor(Math.random() * 256);

    return "rgb(" + r + ", " + g + ", " + b +")";
}