Top 30 React Practice Exercises for Advanced with Solutions

11. Write a component that implements a custom debounce function and displays the debounced input value.

Required Input:

Hardcoded delay: 500ms

Expected Output:

The input value updates only after the user stops typing for 500ms.

Code In React

import React, { useState } from "react";
 
 const DebouncedInput = () => {
  return (
  <div>
  <input type="text" placeholder="Type here..." />
  <p>Debounced Value: </p>
  </div>
  );
 };
 
 export default DebouncedInput;

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12. Create a component that calculates all pairs in a hardcoded array whose sum equals a hardcoded target value.

Required Input:

Array: [1, 2, 3, 4, 5]
 Target: 6

Expected Output:

Pairs: [[1, 5], [2, 4]]

Code In React

import React from "react";
 
 const PairSum = () => {
  return (
  <div>
  {/* Display pairs */}
  </div>
  );
 };
 
 export default PairSum;

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13. Write a component that sorts a hardcoded array of objects by a nested property (e.g., person.address.zipcode) and displays the sorted array.

Required Input:

Array:
 [
  { "name": "Alice", "address": { "zipcode": 12345 } },
  { "name": "Bob", "address": { "zipcode": 54321 } },
  { "name": "Charlie", "address": { "zipcode": 11111 } }
 ]

Expected Output:

Sorted Array: [{ name: 'Charlie' }, { name: 'Alice' }, { name: 'Bob' }]

Code In React

import React from "react";
 
 const SortByNestedProperty = () => {
  return (
  <div>
  {/* Display sorted array */}
  </div>
  );
 };
 
 export default SortByNestedProperty;

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14. Create a component that generates all permutations of a hardcoded string and displays them.

Required Input:

String: 'abc'

Expected Output:

Permutations: ['abc', 'acb', 'bac', 'bca', 'cab', 'cba']

Code In React

import React from "react";
 
 const StringPermutations = () => {
  return (
  <div>
  {/* Display permutations */}
  </div>
  );
 };
 
 export default StringPermutations;

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15. Build a component that finds the common elements between two hardcoded arrays and displays them.

Required Input:

Arrays: [1, 2, 3, 4], [3, 4, 5, 6]

Expected Output:

Common Elements: [3, 4]

Code In React

import React from "react";
 
 const CommonElements = () => {
  return (
  <div>
  {/* Display common elements */}
  </div>
  );
 };
 
 export default CommonElements;

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16. Write a component that determines whether a hardcoded matrix is symmetric and displays the result.

Required Input:

[[1, 2, 3], [2, 4, 5], [3, 5, 6]]

Expected Output:

Is Symmetric: true

Code In React

import React from "react";
 
 const SymmetricMatrix = () => {
  return (
  <div>
  {/* Display whether the matrix is symmetric */}
  </div>
  );
 };
 
 export default SymmetricMatrix;

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17. Create a component that checks if a hardcoded number is a prime number and displays the result.

Required Input:

Expected Output:

Is Prime: true

Code In React

import React from "react";
 
 const PrimeCheck = () => {
  return (
  <div>
  {/* Display whether the number is prime */}
  </div>
  );
 };
 
 export default PrimeCheck;

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18. Write a component that computes the transpose of a hardcoded 2D array and displays it.

Required Input:

[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

Expected Output:

Transposed Array: [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

Code In React

import React from "react";
 
 const TransposeMatrix = () => {
  return (
  <div>
  {/* Display the transposed array */}
  </div>
  );
 };
 
 export default TransposeMatrix;

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19. Create a component that takes a hardcoded array of intervals and merges any overlapping intervals.

Required Input:

[[1, 3], [2, 6], [8, 10], [15, 18]]

Expected Output:

Merged Intervals: [[1, 6], [8, 10], [15, 18]]

Code In React

import React from "react";
 
 const MergeIntervals = () => {
  return (
  <div>
  {/* Display merged intervals */}
  </div>
  );
 };
 
 export default MergeIntervals;

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20. Write a component that identifies the first non-repeating character in a hardcoded string and displays it.

Required Input:

"swiss"

Expected Output:

First Non-Repeating Character: w

Code In React

import React from "react";
 
 const FirstNonRepeatingChar = () => {
  return (
  <div>
  {/* Display the first non-repeating character */}
  </div>
  );
 };
 
 export default FirstNonRepeatingChar;

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