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HTML

              
                <header>
	<h1>Emoji Shop</h1>
</header>

<main>
	<!-- The list of emoji products -->
	<ul id="products"></ul>
	
	<aside>
		<div class="sticky-wrapper">
			<h2>Shopping Cart</h2>
			
			<!-- The list of products in our cart -->
			<ul id="cart"></ul>
			
			<!-- Our cart's total -->
			<div id="total">
				Total: 
				<span id="cart-total" class="price">0</span>
			</div>
		</div>
	</aside>
	
</main>



              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans')

// Variables
$headingGutter: 0.6em
$gutter: 20px
$primaryColor: #ff7a59
$secondaryColor: #cbd6e2
$tertiaryColor: #7fd0dd
$lightestColor: #fff
$textColorOnMid: #2d3e50
$baseFontSize: 15px
$headingScale: 1.5
$boxShadow: inset 0 0 0 0px #00a4bd

$contextFont: (header: 6, main: 0.6, aside: 0.1)

// Mixins
@mixin card 
	transition: 0.3s box-shadow ease, 0.3s transform ease
	padding: $gutter
	border: 1px solid $secondaryColor
	padding: 2em
	border-radius: 5px
	display: flex
	align-items: center
	justify-content: space-around
	flex-direction: column

	&:hover
		box-shadow: 0 10px 20px -5px $secondaryColor
		transform: translateY(-0.2em)

@mixin cta
	display: inline-block
	border: 1px solid $primaryColor
	background-color: $primaryColor
	border-radius: 3px
	padding: 1em 2.5em
	text-decoration: none
	font-size: 0.9em
	font-weight: 600
	color: $lightestColor
	transition: color .35s ease, background-color .35s ease

@mixin ctaAlternate
	background-color: $lightestColor
	color: $primaryColor

body
	font-size: $baseFontSize
	padding-top: 8em
	text-align: center
	font-family: 'Open Sans', sans-serif

// Typography
@each $tagName, $value in $contextFont
	#{$tagName}
		@for $i from 1 through 6
			h#{$i}
				font-size: $baseFontSize + ($i * $value)			
a
	+cta()

	&:hover
		+ctaAlternate()

p
	margin: 0.5em 0

aside
	a
		+ctaAlternate()

		&:hover
			+cta()

// Price currencies
.price
	&::before
		content: '$'

// Layout
main
	display: flex
	flex-direction: row
	position: relative

header
	position: fixed
	top: 0
	left: 0
	width: 100%
	z-index: 1
	padding: 1em
	border-bottom: 2px solid $secondaryColor
	background-color: $lightestColor

aside
	position: sticky
	top: 0
	left: auto
	right: 0
	flex: 1

.sticky-wrapper
	position: sticky
	top: #{$gutter * 5}

// Products List
#products
	list-style: none
	display: grid
	grid-template-columns: 30% 30% 30%
	grid-template-columns: repeat(3, 1fr)
	grid-gap: $gutter
	padding: 0 $gutter
	width: 70%

	li
		+card()

		.emoji
			font-size: 4em
			margin: 0

// Shopping Cart
#cart
	padding: 0 $gutter
	list-style: none

	li
		+card()
		font-size: 80%
		padding: #{$gutter / 2}
		margin: #{$gutter / 2} 0
              
            
!

JS

              
                /**
 * Represents a product.
 * @constructor
 */
class Product {
 	constructor(options) {
		// ANSWER TO 5a:
		const { id, emoji, description, price, inStock } = options;
		this.id = id;
		this.emoji = emoji;
		this.description = description;
		this.price = price;
		this.inStock = inStock;
		
		/* ANSWER TO 5b:
		 * constructor({ id, emoji, description, price, inStock }) {
		 *     this.id = id;
		 *     this.emoji = emoji;
		 *     this.description = description;
		 *     this.price = price;
		 *     this.inStock = inStock;
		 * }
		*/
	}

	// ANSWER TO 6a:
	getHTML(inCart = false) {
	
		if (this.inStock) {
			// ANSWER TO 7a AND 7b:
 			const { id, emoji, description, price, inStock } = this;
			
			// ANSWER TO 8a AND 8b:
			const html = 
				`<li>
					<h3>${description}</h3>

					${!inCart ? `<p class="emoji">${emoji}</p>` : ''}

					${this.quantity > 1
						? `<p>${this.quantity} x
							<span class="price">
								${this.cartPrice}
							</span>
						   </p>`
						: ''}

					<p>
						<span class="price">${price}</span>
					</p>

					${inCart
						? `<a href="#" onClick="cart.removeProduct(${id});">
							  Remove
						   </a>`
						: `<a href="#" data-id="${id}">
							  Add to Cart
						   </a>` 
					}
			    </li>`;
			return html;
		}
		return '';
	}
}

/**
 * Represents a shopping cart.
 * @constructor
 */
class ShoppingCart {
	// ANSWER TO 9a:
	constructor(items = []) {
    	this.items = items;
  	}
  
	addProduct(item) {  
		// ANSWER TO 10a, 10b, AND 10c:
		const matchingItem = this.items.find(currentElement => item.id === currentElement.id);

		if (typeof matchingItem !== 'undefined') {
			const { price } = matchingItem;
			matchingItem.quantity++;
			matchingItem.cartPrice = matchingItem.quantity * price;
			this.updateCart();
		} else {
			const cartItem = new ProductInCart(item);
			this.items.push(cartItem);
			this.updateCart();
		}
	}
  
	removeProduct(id) {
		const matchingItem = this.items.find(item => id === item.id);
		
		if (typeof matchingItem !== 'undefined') {
			const matchingItemIndex = this.items.indexOf(matchingItem);
			this.items.splice(matchingItemIndex, 1);
			this.updateCart();
		}
	}
  
	updateCart() {
		// called whenever an item is added or removed
		const cart = document.getElementById('cart');
		cart.innerHTML = '';
		
		// ANSWER TO 11a AND 11b:
		this.items.forEach(item => cart.innerHTML += item.getHTML(true));
		this.updateTotal();
	}

	updateTotal() {
		// ANSWER TO 12a AND 12b:
		const total = this.items.reduce((currentSum, item) => currentSum + item.cartPrice, 0);
		document.getElementById('cart-total').innerText = total;
	}
}

/**
 * Represents a product in a shopping cart.
 * @constructor
 * @extends Product
 * @param {integer} cartPrice - The total price of this product in the cart.
 * @param {integer} quantity - The quantity of this product in the cart.
 */
class ProductInCart extends Product {
	constructor(options) {
		super(options);
		this.cartPrice = options.price;
		this.quantity = 1;
	}
}

/**
  * Initializes our application.
  */
const url = 'https://raw.githubusercontent.com/anythingcodes/emoji-shop/master/data/emoji.json';
const cart = new ShoppingCart();
// ANSWER TO 13a:
fetch(url)
	.then(serverResponse => serverResponse.json())
	.then(response => {
		const productContainer = document.getElementById('products');
	
		// ANSWER TO 14a:
		const products = response.map(responseItem => {
			const newProduct = new Product(responseItem);
			productContainer.innerHTML += newProduct.getHTML();
			return newProduct;
		});
	
		const links = productContainer.querySelectorAll('a');
	
		// ANSWER TO 15a AND 15c:
		links.forEach(link => {
			// ANSWER TO 13b:
			link.addEventListener('click', evt => {
				evt.preventDefault();
				const id = parseInt(evt.target.getAttribute('data-id'), 10);
				
				// ANSWER TO 15b AND 15bi:
				const matchingProduct = products.find(product => product.id === id);
				
				cart.addProduct(matchingProduct);
			});
		})
	})
	.catch(err => console.log(err));


              
            
!
999px

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