JavaScript Interview and Coding Challenges

This repository contains JavaScript coding examples, interview questions, and solutions. The goal is to help prepare for JavaScript-related technical interviews by practicing coding challenges and understanding basic concepts.

Topics Covered

1. call, apply, and bind Methods

• Description: Explanation and examples of call, apply, and bind methods in JavaScript.
• Usage: Demonstrates how to change the context (this) of a function using these methods.

2. Count Character Occurrences

• Description: A function to count the number of occurrences of each character in a string.
• Use Case: Useful for string manipulation questions in interviews.

3. Currying in JavaScript

• Description: Explanation of currying, a functional programming technique where a function is transformed into a sequence of functions, each taking a single argument.
• Example: Practical examples showing how currying can be used to break down functions into smaller, reusable ones.

4. Find Duplicate Number in an Array

• Description: A solution to find duplicate numbers in an array.
• Example: Covers different methods of finding duplicates, such as using sets and hash maps.

5. Find Factorial of a Number

• Description: A function to compute the factorial of a given number using recursion and iteration.
• Example: Includes optimized solutions for factorial calculations.

6. Find Greatest Common Divisor (GCD)

• Description: A function to compute the GCD of two numbers using the Euclidean algorithm.
• Example: Shows how to use recursion to find the GCD efficiently.

7. Find Max and Min Value in an Array

• Description: A function to find both the maximum and minimum values in an array.
• Example: Covers multiple approaches, including sorting and using array methods.

8. Find Missing Value in an Array

• Description: Solutions for finding the missing value in an arithmetic progression (AP) array.
• Example: Uses mathematical formulas and loops to solve the problem.

9. Find Peak Element

• Description: A function to find the peak element (an element that is greater than its neighbors) in an array.
• Example: Demonstrates how to use binary search for optimal performance.

10. Find Sum of Elements in an Array

• Description: A function to calculate the sum of all elements in an array.
• Example: Uses array methods like reduce for summing values.

11. Reverse an Array

• Description: A function to reverse the elements in an array.
• Example: Covers both in-place and array copying techniques.

12. Sort Array

• Description: Solutions for sorting an array using different algorithms like quicksort, mergesort, and native JavaScript methods.
• Example: Highlights the time complexity of various sorting methods.

13. String Questions

• Description: Various string manipulation questions, including reversing a string, checking for palindromes, and more.
• Example: Includes multiple techniques for solving common string problems.

14. Map, Reduce, and Filter Methods

• Description: Explanation and coding examples of JavaScript’s array methods: map, reduce, and filter.
• Usage: Shows how to use these methods for functional programming.

15. Find Longest String in an Array

• Description: A solution to find the longest string in an array.
• Example: Demonstrates how to iterate over an array to find the longest string efficiently.

16. Generate Fibonacci Sequence

• Description: Functions to generate Fibonacci numbers using both recursion and iteration.
• Example: Includes optimized approaches for generating large Fibonacci sequences.

17. Prime Number Checker

• Description: A function to check whether a given number is prime.
• Example: Includes optimized solutions for large numbers, using trial division and efficient loop bounds.

18. Undefined vs Not Defined

• Description: Explanation of the difference between undefined and variables that are not defined in JavaScript.
• Example: Clarifies common interview questions about these terms.

How to Use

Clone the repository:

git clone https://github.com/your-repo/javascript-coding-challenges.git