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HTML

              
                <div id="root"></div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Nunito+Sans:400,800");

body {
  font-family: "Nunito Sans", sans-serif;
  background: #f9f9f9;
}

.Cart {
  max-width: 800px;
  display: block;
  margin: auto;
  font-family: "Nunito Sans", sans-serif;
  font-weight: 800;
}

.Cart ul {
  list-style-type: none;
}

.Cart li {
  max-width: 400px;
  padding-top: 10px;
  margin-bottom: 30px;
}

.Cart li, .Cart button {
  margin-right: 10px;
}

.Cart button {
  cursor: pointer;
  float: right;
  border: none;
  border-radius: 4px;
  background: #D8D8D8;
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
  padding: 5px;
  transform: translatey(-5px);
}

.cartTotal {
  position: fixed;
  right: 0;
  bottom: 0;
  color: #0e5c2c;
  font-family: "Nunito Sans", sans-serif;
  font-weight: 800;
  font-size: 48px;
  background: #a2bb98;
  border: 10px solid #0e5c2c;
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
  border-radius: 6px 0 0 0;
  padding: 10px 20px;
}

.cartColor {
  min-width: 90px;
  padding: 10px 20px;
  border-radius: 4px;
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
}

.cartColorQty,
.cartColorImport {
  width: 80px;
  float: right;
}

.wall {
  /* columns:4;
  column-gap: 1em; */
  max-width: 800px;
  display: block;
  margin: auto;
  padding-top: 60px;
}

.brick {
  margin: 20px;
  height: 180px;
  width: 150px;
  margin-bottom: 1em;
  clear: both;
  background: #fff;
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
  transition: all 0.5s;
  border-radius: 6px;
  display: inline-block;
}

.brick:hover {
  box-shadow: 0px 15px 30px rgba(0, 0, 0, 0.2) !important;
}

.color {
  grid-area: color;
  position: relative;
  height: 120px !important;
}

.content {
  height: 100%;
  display: grid;
  grid-template-columns: 10px auto 10px;
  grid-template-areas:
    ". color ."
    ". action .";
}

.action {
  /* border: 1px solid red; */
  grid-area: action;

  display: grid;
  grid-template-columns: auto auto;
}

.action p {
  /* padding: 0; */
  font-weight: 800;
  margin: auto;
}

.buyButton {
  cursor: pointer;

  font-weight: 800;
  color: #fff;

  width: 68px;
  height: 25px;
  background: linear-gradient(270deg, #ff3d00 -13.97%, #ffa800 105.15%);
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  border: none;

  position: relative;
  top: 50%;
  left: 15%;
  transform: translateY(-50%);
  transition: box-shadow 0.2s;
}

.color h1 {
  position: absolute;
  z-index: 2;

  font-size: 46px;

  top: 50%;
  left: 50%;
  transform: translate(-40%, -100%);
}

.palette {
  /* border: 1px solid red; */
  position: absolute;
  height: 140px;
  width: 140px;
  left: 5px;
  top: -10px;

  background: #fdff8d;
  box-shadow: 0px 2px 9px rgba(0, 0, 0, 0.2);
  border-radius: 6px;
}

button:focus {
  outline: 0;
}

button:active {
  box-shadow: none;
}

.navBar {
  position: fixed;

  font-family: "Nunito Sans", sans-serif;
  font-weight: 800;
  text-align: right;
  right: 0;
  top: 0;
  background: #fff;
  z-index: 999;

  box-shadow: 0px 15px 30px rgba(0, 0, 0, 0.2);
  border-radius: 0 0 0 6px;
}

.navBar li {
  position: relative;
  display: inline-block;
  padding-right: 50px;
  cursor: pointer;
}

.navBar li:hover {
  font-style: italic;
}

.cartQuantity {
  padding: 0px 5px;
  border-radius: 6px;
  color: #000;
  background: linear-gradient(270deg, #ff3d00 -13.97%, #ffa800 105.15%);
}

              
            
!

JS

              
                const { Component } = React;

// Empty bazar store is initialized on first import.
const { register, poke } = bazar;

const colors = [
  { name: "Yellow", hex: "#FDFF8D", text: "black", price: 615 },
  { name: "Wine", hex: "#4D1310", text: "white", price: 258 },
  { name: "Punch", hex: "#EF5678", text: "black", price: 493 },
  { name: "Blue", hex: "#4342B6", text: "white", price: 807 },
  { name: "Green", hex: "#3CAF49", text: "black", price: 105 },
  { name: "Peach", hex: "#F99484", text: "black", price: 752 },
  { name: "Olive", hex: "#95BE67", text: "black", price: 60 },
  { name: "Rose", hex: "#DF3034", text: "white", price: 810 },
  { name: "Mint", hex: "#97ECC2", text: "black", price: 739 },
  { name: "Lilac", hex: "#B560CA", text: "white", price: 974 },
  { name: "Oil", hex: "#0D0702", text: "white", price: 153 },
  { name: "Teal", hex: "#4DA8AB", text: "white", price: 156 },
  { name: "Slate", hex: "#757A86", text: "white", price: 244 },
  { name: "Blush", hex: "#FEC4E4", text: "black", price: 981 },
  { name: "Sky", hex: "#67C3D8", text: "white", price: 239 },
  { name: "Wood", hex: "#413323", text: "white", price: 343 },
  { name: "Iris", hex: "#9865C2", text: "white", price: 56 },
  { name: "Smoke", hex: "#5A525E", text: "black", price: 902 },
  { name: "Azure", hex: "#2920A2", text: "white", price: 433 },
  { name: "Basil", hex: "#356132", text: "white", price: 743 }
];

const Item = props => {
  const { name, price, hex, text } = props.color;

  const buy = () =>
    poke("App", {
      name,
      type: "increment"
    });

  return (
    <div className="brick">
      <div className="content">
        <div className="color" style={{ color: text }}>
          <div className="palette" style={{ background: hex }} />
          <h1>{name}</h1>
        </div>
        <div className="action">
          <p>$ {price}</p>
          <button className="buyButton" onClick={() => buy()}>
            Buy
          </button>
        </div>
      </div>
    </div>
  );
};

const Shop = props => {
  const items = () => {
    return props.colors.map((color, index) => {
      return <Item color={color} key={index} />;
    });
  };

  return <div className="wall">{items()}</div>;
};

const Cart = props => {
  let total = 0;
  const purchases = props.items.map((item, index) => {
    const { name, hex, price, quantity } = item;
    const currentImport = quantity * price;
    total += currentImport;
    return (
      <li key={index}>
        <span className="cartColor" style={{ background: hex }}>{name}</span>
        <span className="cartColorQty"> x{item.quantity}</span>
        <button onClick={() => poke("App", { name, type: "increment" })}>
          ➕
        </button>
        <button onClick={() => poke("App", { name, type: "decrement" })}>
          ➖
        </button>
        <span className="cartColorImport"> ${currentImport}</span>
        <button onClick={() => poke("App", { name, type: "remove" })}>🗑</button>
      </li>
    );
  });

  return (
    <div className="Cart">
      <ul>{purchases.length === 0 ? "empty (:" : purchases}</ul>
      <div className="cartTotal">$ {total}</div>
    </div>
  );
};

const Navbar = props => (
  <div className="navBar">
    <ul>
      <li onClick={() => props.changeView("shop")}>
        <span role="img" aria-label="shop">
          🏪{" "}
        </span>
        <span>Shop</span>
      </li>
      <li onClick={() => props.changeView("cart")}>
        <span role="img" aria-label="shop">
          🛒{" "}
        </span>
        <span>Cart </span>
        <span className="cartQuantity">{props.quantity}</span>
      </li>
    </ul>
  </div>
);

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      colors: colors.map(e => ({
        ...e,
        quantity: 0
      }))
    };

    register({
      id: "App",
      sync: () => this.state,
      onPoke: arg => {
        const { name, type } = arg;
        console.log('poked', name);
        const { colors } = this.state;
        this.setState({
          colors: colors.map(e => {
            const { quantity } = e;
            return e.name === name
              ? {
                  ...e,
                  quantity: (() => {
                    if (type === "increment") return quantity + 1;
                    else if (type === "remove") return 0;
                    return quantity - 1;
                  })()
                }
              : e;
          })
        });
      }
    });

    this.changeView = this.changeView.bind(this);
  }

  changeView = where => this.setState({ view: where });

  render() {
    const { view = "shop", colors } = this.state;

    const quantity = colors.map(e => e.quantity).reduce((a, b) => a + b);

    const inCart = colors.filter(e => e.quantity > 0);

    return (
      <div className="App">
        <Navbar changeView={this.changeView} quantity={quantity} />
        {view === "shop" ? <Shop colors={colors} /> : <Cart items={inCart} />}
      </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById("root"));

              
            
!
999px

Console