JSFiddle - React, Tailwind, and code Playground

[ASSIGNMENT] Close Frontend Application Quiz

by shauryakalia

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="root"></div>

CSS

.List {
  margin: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  grid-auto-rows: 60px;
  grid-gap: 16px;
}

.List__item {
  line-height: 60px;
  text-align: center;
  color: white;
  text-shadow: 1px 1px rgba(0, 0, 0, 0.5);
  box-shadow: 0px 1px 1px 0px rgba(0, 0, 0, 0.05);
}

/* Taken from https://clrs.cc/ */

.List__item--navy {
  background-color: #001f3f;
}

.List__item--blue {
  background-color: #0074d9;
}

.List__item--aqua {
  background-color: #7fdbff;
}

.List__item--teal {
  background-color: #39cccc;
}

.List__item--olive {
  background-color: #3d9970;
}

.List__item--green {
  background-color: #2ecc40;
}

.List__item--lime {
  background-color: #01ff70;
}

.List__item--yellow {
  background-color: #ffdc00;
}

.List__item--orange {
  background-color: #ff851b;
}

.List__item--red {
  background-color: #ff4136;
}

.List__item--maroon {
  background-color: #85144b;
}

.List__item--fuchsia {
  background-color: #f012be;
}

.List__item--purple {
  background-color: #b10dc9;
}

.List__item--black {
  background-color: #111111;
}

.List__item--gray {
  background-color: #aaaaaa;
}

.List__item--silver {
  background-color: #dddddd;
}

.selected {
  opacity: 0.5;
}

.deselected {
  opacity: 1;
}

React

const { Fragment, useState, memo } = React;


// Implement a feature to allow item selection with the following requirements:
// 1. Clicking an item selects/unselects it.
// 2. Multiple items can be selected at a time.
// 3. Make sure to avoid unnecessary re-renders of each list item in the big list (performance).
// 4. Currently selected items should be visually highlighted.
// 5. Currently selected items' names should be shown at the top of the page.
//
// Feel free to change the component structure at will.
function LI({ name, color, setSelectedItems, selectedItems }) {
  const toggle = () => {
      if (event.target.classList.contains('selected')) {
        event.target.classList.add('deselected');
        event.target.classList.remove('selected');
        let newItems = selectedItems;
        let index = selectedItems.indexOf(event.target.textContent + ' ');
        newItems.splice(index,1);
        setSelectedItems([...newItems]);
      } else {
        event.target.classList.add('selected');
        setSelectedItems(selectedItems => [...selectedItems, event.target.textContent + ' ']);
      } 
    }
  return (
            <li key={name} className={`List__item List__item--${color}`} onClick={toggle}>
              {name}
            </li>
    );
};

const MemoizedLI = memo(LI);

const List = ({ items }) => {
	const [selectedItems, setSelectedItems] = useState([]);
  return (
    <Fragment>
    {selectedItems}
      <ul className="List">
        {items.map(item => (
          <MemoizedLI 
            key={item.name} 
            color={item.color} 
            name={item.name} 
            setSelectedItems={setSelectedItems} 
            selectedItems={selectedItems}
           />
        ))}
      </ul>
    </Fragment>
);
}

// ---------------------------------------
// Do NOT change anything below this line.
// ---------------------------------------

const sizes = ['tiny', 'small', 'medium', 'large', 'huge'];
const colors = ['navy', 'blue', 'aqua',...