JSFiddle - React, Tailwind, and code Playground

[ASSIGNMENT] Close Frontend Application Quiz

by touqeer_shakeel

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;
}

.List__item--selected {
  border: 3px solid red;
}

.SelectedItems {
  list-style: decimal;
  margin: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  grid-auto-rows: 20px;
  grid-gap: 8px;
}

React

const { Fragment, useState, useCallback, useMemo } = 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.

const List = React.memo(({ items }) => {
  const [selectedItems, setSelectedItems] = useState([]);

  const handleItemClick = useCallback(
    (item) => {
      if (selectedItems.includes(item)) {
        setSelectedItems(selectedItems.filter((selectedItem) => selectedItem !== item));
      } else {
        setSelectedItems([...selectedItems, item]);
      }
    },
    [selectedItems]
  );

  const isItemSelected = useCallback((item) => selectedItems.includes(item), [selectedItems]);

  const selectedItemsMemo = useMemo(
    () =>
      selectedItems.map((item) => (
        <li key={item.name} className={`SelectedItems__item SelectedItems__item--${item.color}`}>
          {item.name}
        </li>
      )),
    [selectedItems]
  );

  const listItemsMemo = useMemo(
    () =>
      items.map((item) => (
        <li
          key={item.name}
          className={`List__item List__item--${item.color} ${isItemSelected(item) ? 'List__item--selected' : ''}`}
          onClick={() => handleItemClick(item)}
        >
          {item.name}
        </li>
      )),
    [items, isItemSelected, handleItemClick]
  );

  return (
    <Fragment>
      <ol className="List SelectedItems">{selectedItemsMemo}</ol>
      <ul className="List">{listItemsMemo}</ul>
    </Fragment>
  );
});


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

const sizes = ['tiny', 'small', 'medium',...