JSFiddle - React, Tailwind, and code Playground

[ASSIGNMENT] Close Frontend Application Quiz

by aspirisen

HTML

<script src="https://unpkg.com/[email protected]/umd/react.production.min.js"></script>
<script src="https://unpkg.com/[email protected]/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);
}

.List__item--selected {
  outline: 2px solid red;
}

/* 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;
}

React

const { Fragment, memo, useState, useCallback } = 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 = ({ items }) => {
  const [selected, setSelected] = useState(() => new Set());

  const selectItem = useCallback(
    (item) => {
    	debugger;
      setSelected((prevSelected) => {
        if (prevSelected.has(item.name)) {
          prevSelected.delete(item.name);
          return new Set(selected);
        } else {
          return selected.add(item.name);
        }
      });
    },
    [setSelected],
  );
  
  console.log('render', selected)

  return (
    <Fragment>
      <ul className="List">
        {items.map((item) => (
          <Item
            key={item.name}
            item={item}
            isSelected={selected.has(item.name)}
            onSelect={selectItem}
          />
        ))}
      </ul>
    </Fragment>
  );
};

const Item = memo(({ item, isSelected, onSelect }) => {
  return (
    <li
      onClick={() => onSelect(item)}
      className={`List__item List__item--${item.color} ${
        isSelected ? "List__item--selected" : ""
      }`}
    >
      {item.name}
    </li>
  );
});

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

const sizes = ['tiny', 'small', 'medium', 'large', 'huge'];
const colors = ['navy', 'blue', 'aqua', 'teal', 'olive', 'green', 'lime', 'yellow', 'orange', 'red', 'maroon', 'fuchsia', 'purple', 'silver', 'gray', 'black'];
const fruits = ['apple', 'banana', 'watermelon', 'orange', 'peach', 'tangerine',...