React js Project-Based Practice Questions with Solutions

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Introduction

Project-based practice is one of the best ways to understand React beyond individual concepts. In this chapter, you will work on practical React projects that combine components, props, state, forms, Hooks, routing, APIs, search, filtering, and CRUD operations. Each question focuses on building a useful application feature so that you can test how well you can apply React concepts in a real project. React js Project-Based Practice questions with solutions to help you to build concepts in React projects

1. Build a React Notes Application

Problem Statement

Create a React Notes Application where users can add and display notes.

The application should have:

  • Note title
  • Note content
  • Add Note button
  • List of notes

React Solution

import { useState } from "react";

function NotesApp() {
  const [title, setTitle] = useState("");
  const [content, setContent] = useState("");

  const [notes, setNotes] = useState([]);

  function addNote(e) {
    e.preventDefault();

    if (!title.trim() || !content.trim()) {
      return;
    }

    const newNote = {
      id: crypto.randomUUID(),
      title: title.trim(),
      content: content.trim()
    };

    setNotes((currentNotes) => [
      ...currentNotes,
      newNote
    ]);

    setTitle("");
    setContent("");
  }

  return (
    <div>
      <h1>Notes App</h1>

      <form onSubmit={addNote}>
        <input
          type="text"
          placeholder="Note title"
          value={title}
          onChange={(e) => setTitle(e.target.value)}
        />

        <textarea
          placeholder="Note content"
          value={content}
          onChange={(e) => setContent(e.target.value)}
        />

        <button type="submit">
          Add Note
        </button>
      </form>

      {notes.map((note) => (
        <article key={note.id}>
          <h2>{note.title}</h2>
          <p>{note.content}</p>
        </article>
      ))}
    </div>
  );
}

export default NotesApp;

Output

Notes App

[Note title]
[Note content]

[Add Note]

React Basics
Learn components and JSX.

JavaScript Arrays
Practice map() and filter().

Explanation

This project combines controlled inputs, useState, forms, objects, arrays, map(), and immutable state updates.

The notes are stored in an array:

const [notes, setNotes] = useState([]);

A new note is added without directly mutating the existing array.

Concepts Covered

  • useState
  • Forms
  • Controlled inputs
  • Objects
  • Arrays
  • map()
  • Immutable updates

2. Build a React Expense Tracker

Problem Statement

Create an Expense Tracker that allows users to add expenses and calculate the total amount.

Each expense should contain:

  • Title
  • Amount
  • Category

React Solution

import { useState } from "react";

function ExpenseTracker() {
  const [title, setTitle] = useState("");
  const [amount, setAmount] = useState("");
  const [category, setCategory] = useState("Food");

  const [expenses, setExpenses] = useState([]);

  function addExpense(e) {
    e.preventDefault();

    const numericAmount = Number(amount);

    if (!title.trim() || numericAmount <= 0) {
      return;
    }

    const newExpense = {
      id: crypto.randomUUID(),
      title: title.trim(),
      amount: numericAmount,
      category
    };

    setExpenses((currentExpenses) => [
      ...currentExpenses,
      newExpense
    ]);

    setTitle("");
    setAmount("");
  }

  const total = expenses.reduce(
    (sum, expense) => sum + expense.amount,
    0
  );

  return (
    <div>
      <h1>Expense Tracker</h1>

      <form onSubmit={addExpense}>
        <input
          type="text"
          placeholder="Expense title"
          value={title}
          onChange={(e) => setTitle(e.target.value)}
        />

        <input
          type="number"
          placeholder="Amount"
          value={amount}
          onChange={(e) => setAmount(e.target.value)}
        />

        <select
          value={category}
          onChange={(e) => setCategory(e.target.value)}
        >
          <option value="Food">Food</option>
          <option value="Travel">Travel</option>
          <option value="Shopping">Shopping</option>
        </select>

        <button type="submit">
          Add Expense
        </button>
      </form>

      <h2>Total: ₹{total}</h2>

      {expenses.map((expense) => (
        <div key={expense.id}>
          <h3>{expense.title}</h3>
          <p>Category: {expense.category}</p>
          <p>Amount: ₹{expense.amount}</p>
        </div>
      ))}
    </div>
  );
}

export default ExpenseTracker;

Output

Expense Tracker

Food
₹500

Travel
₹1,000

Shopping
₹700

Total: ₹2,200

Explanation

reduce() is used to calculate the total expense.

const total = expenses.reduce(
  (sum, expense) => sum + expense.amount,
  0
);

The total is derived from the expenses instead of being stored as separate duplicate state.

Concepts Covered

  • Forms
  • useState
  • reduce()
  • Controlled inputs
  • Derived data
  • Array operations

3. Build a React Product Search Application

Problem Statement

Create a product search application where users can search products by name and filter them by category in react projects

React Solution

import { useState } from "react";

function ProductSearch() {
  const [search, setSearch] = useState("");
  const [category, setCategory] = useState("All");

  const products = [
    {
      id: 1,
      name: "Laptop",
      category: "Electronics"
    },
    {
      id: 2,
      name: "Headphones",
      category: "Electronics"
    },
    {
      id: 3,
      name: "Running Shoes",
      category: "Fashion"
    },
    {
      id: 4,
      name: "T-Shirt",
      category: "Fashion"
    }
  ];

  const filteredProducts = products.filter((product) => {
    const matchesSearch = product.name
      .toLowerCase()
      .includes(search.toLowerCase().trim());

    const matchesCategory =
      category === "All" ||
      product.category === category;

    return matchesSearch && matchesCategory;
  });

  return (
    <div>
      <h1>Product Search</h1>

      <input
        type="text"
        placeholder="Search product"
        value={search}
        onChange={(e) => setSearch(e.target.value)}
      />

      <select
        value={category}
        onChange={(e) => setCategory(e.target.value)}
      >
        <option value="All">All</option>
        <option value="Electronics">Electronics</option>
        <option value="Fashion">Fashion</option>
      </select>

      {filteredProducts.length === 0 ? (
        <p>No products found.</p>
      ) : (
        filteredProducts.map((product) => (
          <article key={product.id}>
            <h2>{product.name}</h2>
            <p>{product.category}</p>
          </article>
        ))
      )}
    </div>
  );
}

export default ProductSearch;

Output

If the user searches for Laptop:

Product Search

[Laptop]

[All]

Laptop
Electronics

Explanation

The project combines two filters:

return matchesSearch &amp;&amp; matchesCategory;

This means a product must match the search condition and the selected category.

Concepts Covered

  • useState
  • Search
  • Filtering
  • Controlled inputs
  • Conditional rendering
  • map()

4. Build a React Quiz Application

Problem Statement

Create a quiz application that displays questions one at a time and calculates the user’s score.

React Solution

import { useState } from "react";

function QuizApp() {
  const questions = [
    {
      question: "Which Hook is commonly used for state?",
      options: [
        "useState",
        "useRoute",
        "usePage",
        "useStyle"
      ],
      answer: "useState"
    },
    {
      question: "Which method creates a new array by transforming items?",
      options: [
        "map()",
        "push()",
        "sort()",
        "pop()"
      ],
      answer: "map()"
    }
  ];

  const [currentQuestion, setCurrentQuestion] =
    useState(0);

  const [score, setScore] = useState(0);
  const [finished, setFinished] = useState(false);

  function selectAnswer(option) {
    const question = questions[currentQuestion];

    if (option === question.answer) {
      setScore((currentScore) => currentScore + 1);
    }

    if (currentQuestion === questions.length - 1) {
      setFinished(true);
    } else {
      setCurrentQuestion(
        (current) => current + 1
      );
    }
  }

  if (finished) {
    return (
      <div>
        <h1>Quiz Finished</h1>
        <p>
          Score: {score} / {questions.length}
        </p>
      </div>
    );
  }

  const question = questions[currentQuestion];

  return (
    <div>
      <h1>React Quiz</h1>

      <h2>{question.question}</h2>

      {question.options.map((option) => (
        <button
          key={option}
          onClick={() => selectAnswer(option)}
        >
          {option}
        </button>
      ))}
    </div>
  );
}

export default QuizApp;

Output

React Quiz

Which Hook is commonly used for state?

[useState]
[useRoute]
[usePage]
[useStyle]

After completing the quiz:

Quiz Finished

Score: 2 / 2

Explanation

The application uses state to track:

  • Current question
  • Score
  • Whether the quiz is finished

The question array provides the quiz data, while map() renders the available options.

Concepts Covered

  • useState
  • Events
  • Conditional rendering
  • Arrays
  • map()
  • State updates

5. Build a React Task Management Application

Problem Statement

Create a task management application where users can:

  • Add tasks
  • Mark tasks as completed
  • Delete tasks
  • Display pending and completed task counts

React Solution

import { useState } from "react";

function TaskManager() {
  const [taskText, setTaskText] = useState("");

  const [tasks, setTasks] = useState([]);

  function addTask(e) {
    e.preventDefault();

    if (!taskText.trim()) {
      return;
    }

    setTasks((currentTasks) => [
      ...currentTasks,
      {
        id: crypto.randomUUID(),
        text: taskText.trim(),
        completed: false
      }
    ]);

    setTaskText("");
  }

  function toggleTask(id) {
    setTasks((currentTasks) =>
      currentTasks.map((task) =>
        task.id === id
          ? {
              ...task,
              completed: !task.completed
            }
          : task
      )
    );
  }

  function deleteTask(id) {
    setTasks((currentTasks) =>
      currentTasks.filter(
        (task) => task.id !== id
      )
    );
  }

  const completedCount = tasks.filter(
    (task) => task.completed
  ).length;

  const pendingCount =
    tasks.length - completedCount;

  return (
    <div>
      <h1>Task Manager</h1>

      <form onSubmit={addTask}>
        <input
          value={taskText}
          placeholder="Enter task"
          onChange={(e) =>
            setTaskText(e.target.value)
          }
        />

        <button type="submit">
          Add Task
        </button>
      </form>

      <p>Pending: {pendingCount}</p>
      <p>Completed: {completedCount}</p>

      {tasks.map((task) => (
        <div key={task.id}>
          <span>
            {task.completed ? "✓ " : ""}
            {task.text}
          </span>

          <button
            onClick={() => toggleTask(task.id)}
          >
            Toggle
          </button>

          <button
            onClick={() => deleteTask(task.id)}
          >
            Delete
          </button>
        </div>
      ))}
    </div>
  );
}

export default TaskManager;

Output

Task Manager

[Learn React          ] [Add Task]

Pending: 2
Completed: 1

Learn React       [Toggle] [Delete]
Practice Hooks   ✓ [Toggle] [Delete]
Build Project     [Toggle] [Delete]

Explanation

This project combines several common React operations.

map() updates a task:

task.id === id
  ? { ...task, completed: !task.completed }
  : task

filter() removes a task.

The completed count is derived from the current task list.

Concepts Covered

  • useState
  • Forms
  • map()
  • filter()
  • Object spread
  • Derived data
  • Event handling

6. Build a React User Directory with API Data

Problem Statement

Create a user directory that loads users from an API and displays loading, error, search, and result states.

React Solution

import { useEffect, useState } from "react";

function UserDirectory() {
  const [users, setUsers] = useState([]);
  const [search, setSearch] = useState("");
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");

  useEffect(() => {
    async function loadUsers() {
      try {
        const response = await fetch(
          "https://example.com/api/users"
        );

        if (!response.ok) {
          throw new Error("Unable to load users.");
        }

        const data = await response.json();

        setUsers(data);
      } catch (error) {
        setError(error.message);
      } finally {
        setLoading(false);
      }
    }

    loadUsers();
  }, []);

  const filteredUsers = users.filter((user) =>
    user.name
      .toLowerCase()
      .includes(search.toLowerCase().trim())
  );

  if (loading) {
    return <p>Loading users...</p>;
  }

  if (error) {
    return <p>{error}</p>;
  }

  return (
    <div>
      <h1>User Directory</h1>

      <input
        type="text"
        placeholder="Search users"
        value={search}
        onChange={(e) => setSearch(e.target.value)}
      />

      {filteredUsers.length === 0 ? (
        <p>No users found.</p>
      ) : (
        filteredUsers.map((user) => (
          <article key={user.id}>
            <h2>{user.name}</h2>
            <p>{user.email}</p>
          </article>
        ))
      )}
    </div>
  );
}

export default UserDirectory;

Output

During loading:

Loading users...

After loading:

User Directory

[Search users]

Aman Sharma
aman@example.com

Priya Singh
priya@example.com

Explanation

This project combines API integration with search.

The main states are:

users
search
loading
error

The API URL shown here is a placeholder. A real project should use the endpoint and response structure provided by the selected backend/API.

Concepts Covered

  • useEffect
  • useState
  • API integration
  • fetch()
  • Loading state
  • Error state
  • Search
  • Filtering

7. Build a React Admin Dashboard

Problem Statement

Create a basic admin dashboard containing:

  • Sidebar
  • Header
  • Statistics cards
  • Recent users
  • Dashboard data

React Solution

function StatCard({ title, value }) {
  return (
    <div>
      <h3>{title}</h3>
      <p>{value}</p>
    </div>
  );
}

function Sidebar() {
  return (
    <aside>
      <h2>Admin Panel</h2>

      <nav>
        <p>Dashboard</p>
        <p>Users</p>
        <p>Orders</p>
        <p>Settings</p>
      </nav>
    </aside>
  );
}

function Header() {
  return (
    <header>
      <h1>Dashboard</h1>
      <p>Welcome, Admin</p>
    </header>
  );
}

function Dashboard() {
  const statistics = [
    {
      id: 1,
      title: "Users",
      value: 1200
    },
    {
      id: 2,
      title: "Orders",
      value: 350
    },
    {
      id: 3,
      title: "Revenue",
      value: "₹75,000"
    }
  ];

  return (
    <div>
      <Sidebar />

      <main>
        <Header />

        <section>
          {statistics.map((item) => (
            <StatCard
              key={item.id}
              title={item.title}
              value={item.value}
            />
          ))}
        </section>
      </main>
    </div>
  );
}

export default Dashboard;

Output

Admin Panel

Dashboard
Users
Orders
Settings

Dashboard
Welcome, Admin

Users
1200

Orders
350

Revenue
₹75,000

Explanation

The dashboard is divided into reusable components:

  • Sidebar
  • Header
  • StatCard
  • Dashboard

The statistics are stored in an array and rendered dynamically.

This structure makes it easier to extend the dashboard later with routing, API data, charts, tables, authentication, and permission-based UI.

Concepts Covered

  • Component composition
  • Props
  • map()
  • Reusable components
  • Dashboard layout
  • Dynamic data

8. Build a React Shopping Cart Project

Problem Statement

Create a shopping cart application where users can:

  • View products
  • Add products to the cart
  • Increase quantity
  • Decrease quantity
  • Remove products
  • Calculate total price

React Solution

import { useState } from "react";

function ShoppingCart() {
  const products = [
    {
      id: 1,
      name: "Laptop",
      price: 50000
    },
    {
      id: 2,
      name: "Keyboard",
      price: 1500
    },
    {
      id: 3,
      name: "Mouse",
      price: 800
    }
  ];

  const [cart, setCart] = useState([]);

  function addToCart(product) {
    setCart((currentCart) => {
      const existing = currentCart.find(
        (item) => item.id === product.id
      );

      if (existing) {
        return currentCart.map((item) =>
          item.id === product.id
            ? {
                ...item,
                quantity: item.quantity + 1
              }
            : item
        );
      }

      return [
        ...currentCart,
        {
          ...product,
          quantity: 1
        }
      ];
    });
  }

  function updateQuantity(id, change) {
    setCart((currentCart) =>
      currentCart
        .map((item) =>
          item.id === id
            ? {
                ...item,
                quantity: item.quantity + change
              }
            : item
        )
        .filter((item) => item.quantity > 0)
    );
  }

  const total = cart.reduce(
    (sum, item) =>
      sum + item.price * item.quantity,
    0
  );

  return (
    <div>
      <h1>Shopping Cart</h1>

      <h2>Products</h2>

      {products.map((product) => (
        <div key={product.id}>
          <h3>{product.name}</h3>
          <p>₹{product.price}</p>

          <button
            onClick={() => addToCart(product)}
          >
            Add to Cart
          </button>
        </div>
      ))}

      <h2>Cart</h2>

      {cart.length === 0 ? (
        <p>Your cart is empty.</p>
      ) : (
        cart.map((item) => (
          <div key={item.id}>
            <p>
              {item.name} × {item.quantity}
            </p>

            <button
              onClick={() =>
                updateQuantity(item.id, -1)
              }
            >
              -
            </button>

            <button
              onClick={() =>
                updateQuantity(item.id, 1)
              }
            >
              +
            </button>
          </div>
        ))
      )}

      <h2>Total: ₹{total}</h2>
    </div>
  );
}

export default ShoppingCart;

Output

Products

Laptop
₹50,000
[Add to Cart]

Keyboard
₹1,500
[Add to Cart]

Cart

Laptop × 1 [-] [+]

Total: ₹50,000

Explanation

This project brings together state, props, events, arrays, find(), map(), filter(), and reduce().

The cart stores the quantity of each product.

The total price is derived from the cart:

const total = cart.reduce(
  (sum, item) =>
    sum + item.price * item.quantity,
  0
);

Concepts Covered

  • useState
  • Props
  • find()
  • map()
  • filter()
  • reduce()
  • Immutable updates
  • Event handling
  • Derived data

9. Build a React Multi-Page Application with Routing

Problem Statement

Create a React application with multiple pages:

  • Home
  • About
  • Products
  • Contact

Use React Router for navigation.

React Solution

import {
  BrowserRouter,
  Routes,
  Route,
  Link
} from "react-router-dom";

function Home() {
  return <h1>Home Page</h1>;
}

function About() {
  return <h1>About Page</h1>;
}

function Products() {
  return <h1>Products Page</h1>;
}

function Contact() {
  return <h1>Contact Page</h1>;
}

function App() {
  return (
    <BrowserRouter>
      <nav>
        <Link to="/">Home</Link>{" "}
        <Link to="/about">About</Link>{" "}
        <Link to="/products">Products</Link>{" "}
        <Link to="/contact">Contact</Link>
      </nav>

      <Routes>
        <Route path="/" element={<Home />} />
        <Route
          path="/about"
          element={<About />}
        />
        <Route
          path="/products"
          element={<Products />}
        />
        <Route
          path="/contact"
          element={<Contact />}
        />
      </Routes>
    </BrowserRouter>
  );
}

export default App;

Output

Home | About | Products | Contact

Clicking Products displays:

Products Page

Explanation

BrowserRouter provides routing support.

Routes contains the application’s routes.

Each Route maps a URL path to a React element.

Link provides client-side navigation without manually changing the browser location with ordinary anchor behavior.

Concepts Covered

  • React Router
  • BrowserRouter
  • Routes
  • Route
  • Link
  • Multiple pages
  • Client-side navigation

10. Build a Complete React Project

Problem Statement

Build a practical React application that combines the concepts learned throughout the React practice series.

Create a Student Management Dashboard with:

  • Dashboard statistics
  • Student list
  • Add student form
  • Search students
  • Course filtering
  • Delete student
  • Individual student selection
  • Reusable components
  • Derived student count

React Solution

import { useState } from "react";

function StudentCard({
  student,
  onSelect,
  onDelete
}) {
  return (
    <article>
      <h3>{student.name}</h3>

      <p>Email: {student.email}</p>
      <p>Course: {student.course}</p>

      <button
        onClick={() => onSelect(student)}
      >
        View
      </button>

      <button
        onClick={() => onDelete(student.id)}
      >
        Delete
      </button>
    </article>
  );
}

function StudentDashboard() {
  const [students, setStudents] = useState([
    {
      id: 1,
      name: "Aman Sharma",
      email: "aman@example.com",
      course: "React"
    },
    {
      id: 2,
      name: "Priya Singh",
      email: "priya@example.com",
      course: "Python"
    },
    {
      id: 3,
      name: "Rahul Kumar",
      email: "rahul@example.com",
      course: "React"
    }
  ]);

  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [course, setCourse] = useState("React");

  const [search, setSearch] = useState("");
  const [filterCourse, setFilterCourse] =
    useState("All");

  const [selectedStudent, setSelectedStudent] =
    useState(null);

  function addStudent(e) {
    e.preventDefault();

    if (!name.trim() || !email.trim()) {
      return;
    }

    const newStudent = {
      id: crypto.randomUUID(),
      name: name.trim(),
      email: email.trim(),
      course
    };

    setStudents((currentStudents) => [
      ...currentStudents,
      newStudent
    ]);

    setName("");
    setEmail("");
  }

  function deleteStudent(id) {
    setStudents((currentStudents) =>
      currentStudents.filter(
        (student) => student.id !== id
      )
    );

    if (selectedStudent?.id === id) {
      setSelectedStudent(null);
    }
  }

  const filteredStudents = students.filter(
    (student) => {
      const matchesSearch =
        student.name
          .toLowerCase()
          .includes(search.toLowerCase().trim());

      const matchesCourse =
        filterCourse === "All" ||
        student.course === filterCourse;

      return matchesSearch && matchesCourse;
    }
  );

  const reactStudents = students.filter(
    (student) => student.course === "React"
  ).length;

  const pythonStudents = students.filter(
    (student) => student.course === "Python"
  ).length;

  if (selectedStudent) {
    return (
      <div>
        <button
          onClick={() => setSelectedStudent(null)}
        >
          Back
        </button>

        <h1>{selectedStudent.name}</h1>

        <p>
          Email: {selectedStudent.email}
        </p>

        <p>
          Course: {selectedStudent.course}
        </p>

        <button
          onClick={() =>
            deleteStudent(selectedStudent.id)
          }
        >
          Delete Student
        </button>
      </div>
    );
  }

  return (
    <div>
      <h1>Student Management Dashboard</h1>

      <section>
        <h2>Total Students</h2>
        <p>{students.length}</p>

        <h2>React Students</h2>
        <p>{reactStudents}</p>

        <h2>Python Students</h2>
        <p>{pythonStudents}</p>
      </section>

      <hr />

      <h2>Add Student</h2>

      <form onSubmit={addStudent}>
        <input
          type="text"
          placeholder="Student name"
          value={name}
          onChange={(e) =>
            setName(e.target.value)
          }
        />

        <input
          type="email"
          placeholder="Student email"
          value={email}
          onChange={(e) =>
            setEmail(e.target.value)
          }
        />

        <select
          value={course}
          onChange={(e) =>
            setCourse(e.target.value)
          }
        >
          <option value="React">React</option>
          <option value="Python">Python</option>
        </select>

        <button type="submit">
          Add Student
        </button>
      </form>

      <hr />

      <h2>Students</h2>

      <input
        type="text"
        placeholder="Search students"
        value={search}
        onChange={(e) =>
          setSearch(e.target.value)
        }
      />

      <select
        value={filterCourse}
        onChange={(e) =>
          setFilterCourse(e.target.value)
        }
      >
        <option value="All">All Courses</option>
        <option value="React">React</option>
        <option value="Python">Python</option>
      </select>

      <p>
        Showing {filteredStudents.length} student(s)
      </p>

      {filteredStudents.length === 0 ? (
        <p>No students found.</p>
      ) : (
        filteredStudents.map((student) => (
          <StudentCard
            key={student.id}
            student={student}
            onSelect={setSelectedStudent}
            onDelete={deleteStudent}
          />
        ))
      )}
    </div>
  );
}

export default StudentDashboard;

Output

Student Management Dashboard

Total Students
3

React Students
2

Python Students
1

Add Student

[Student name]
[Student email]
[React ▼]
[Add Student]

Students

[Search students]
[All Courses ▼]

Showing 3 student(s)

Aman Sharma
Email: aman@example.com
Course: React
[View] [Delete]

Priya Singh
Email: priya@example.com
Course: Python
[View] [Delete]

Rahul Kumar
Email: rahul@example.com
Course: React
[View] [Delete]

Explanation

This final project combines many concepts from the complete React practice series.

Step 1: Manage Application State

The application uses state for:

students
name
email
course
search
filterCourse
selectedStudent

Each piece of state has a specific purpose.

Step 2: Add Students

A controlled form collects student information and creates a new student object.

const newStudent = {
  id: crypto.randomUUID(),
  name: name.trim(),
  email: email.trim(),
  course
};

Step 3: Delete Students

The selected student is removed using filter().

setStudents((currentStudents) =>
  currentStudents.filter(
    (student) => student.id !== id
  )
);

Step 4: Search Students

The application searches student names using a derived filtered list.

student.name
  .toLowerCase()
  .includes(search.toLowerCase().trim())

Step 5: Filter by Course

Search and course filtering are combined using &&.

return matchesSearch && matchesCourse;

Step 6: Display Statistics

Student counts are calculated from the current student array.

const reactStudents = students.filter(
  (student) => student.course === "React"
).length;

These values are derived instead of being stored as duplicate state.

Step 7: Use Reusable Components

StudentCard handles the display of an individual student.

The parent component passes data and event handlers through props.

<StudentCard
  student={student}
  onSelect={setSelectedStudent}
  onDelete={deleteStudent}
/>

Step 8: Display an Individual Student

selectedStudent controls whether the application shows the student list or the selected student’s details.

This demonstrates how state can control different views inside an application.

Concepts Covered

  • React components
  • Props
  • Props destructuring
  • useState
  • Forms
  • Controlled inputs
  • Event handling
  • map()
  • filter()
  • Conditional rendering
  • Search
  • Category filtering
  • Derived data
  • Immutable state updates
  • Reusable components
  • CRUD-style operations
  • Project structure
  • Practical application design

Key Takeaways

  • Project-based practice helps you understand how individual React concepts work together.
  • A real React projects usually contains multiple components instead of putting everything into one component.
  • useState can manage interactive application data.
  • Props allow parent components to pass data and event handlers to child components.
  • Forms and controlled inputs are important for applications that collect user data.
  • map() is commonly used to render collections.
  • filter() is useful for searching, filtering, and deleting items.
  • reduce() can calculate totals from arrays.
  • Derived data should usually be calculated from existing state instead of stored as duplicate state.
  • useEffect can synchronize a component with external systems such as APIs.
  • Loading, error, empty, and success states make API-based applications easier to use.
  • React Router can organize applications that contain multiple client-side routes.
  • Reusable components make large applications easier to maintain.
  • A production application may require a backend, database, authentication, authorization, validation, testing, and deployment.
  • Client-side React code should not be treated as a security boundary; important authorization rules must also be enforced on the server.
  • The best way to improve React skills is to build projects, find problems, and solve them step by step.

FAQs

1. What are React Projects-Based Practice Questions?

React Projects-Based Practice Questions are practical coding tasks that require you to combine multiple React concepts to build application features or complete projects.

2. Which React concepts should I know before starting project-based practice?

You should understand components, JSX, props, state, Hooks, events, forms, lists, conditional rendering, array methods, and basic API integration.

3. What projects can I build to practice React?

You can build projects such as Todo Apps, Shopping Carts, Weather Apps, Blog Applications, Expense Trackers, Quiz Apps, Dashboards, Notes Apps, and Student Management Systems.

4. How do React projects improve coding skills?

Projects require you to combine multiple concepts instead of practicing each concept separately. This helps you understand application structure, state management, user interactions, data flow, and problem solving.

5. Should I use an API in React projects?

Using an API is useful for practicing real-world data fetching, loading states, error handling, and asynchronous JavaScript. However, not every beginner project needs an API.

6. Can React projects use a database?

Yes. A React frontend can communicate with a backend API that stores information in a database. React itself is not a database.

7. What should I build after completing React projects-based practice?

After completing these projects, you can create larger applications that combine routing, APIs, authentication, CRUD operations, reusable components, forms, performance techniques, and backend services.

Written by Shubhranshu Shekhar, who has trained 20000+ students in coding.

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