Daily Coding Challenges & Projects

Frontend Mini Project Challenge

Theme : JavaScript Logical Puzzle & Debugging

Challenge :

Write a function to deeply clone a nested object without using JSON.stringify.

Requirements :

• Handle arrays, objects, and nested structures.
• Preserve data types like Date or RegExp.

Bonus : Support circular references detection.

Backend Challenge

Language Focus : C, C++, C#

C# Task :

Create a program to reverse a singly linked list.

Bonus : Make the function generic to handle any data type.

Database Query Challenge

Problems on SQL - HR Database :

1. Write a query to find employees who joined in the last 6 months and work in the 'Sales' department.
2. Write a query to list managers who supervise more than 3 employees.

Data Structures & Algorithms Challenge

• Easy:
• Problem : Find the maximum element in an array.
• Hint : Iterate through array and track max.
• Medium:
• Problem : Implement a stack using two queues.
• Hint : One queue holds data, other assists with operations.
• Hard:
• Problem :Detect a cycle in a directed graph.
• Hint : Use DFS with recursion stack tracking.

Bug of the Day

Language : C

C Bug

Buggy Code:

#include 

int main() {
    int x = 5;
    if (x = 10) {
        printf("X is ten\n");
    }
    return 0;
}

Challenge :

Find and fix the bug.

Hint : Assignment or comparison?

📋 Daily Micro-Project

Frontend Focus :

Task :

Build a CSS-only animated loading spinner with dots or bars.

Bonus: Add accessibility features (ARIA labels).

Trivia: 5 Fun Facts

1. C was developed in 1972 by Dennis Ritchie.
2. C++ adds object-oriented features to C.
3. C# is primarily used for .NET applications.
4. JavaScript was created in just 10 days.
5. Debugging term originates from removing actual bugs from hardware.

Tool & Resource of the Day

Tool : JSFiddle

Online playground to test JavaScript, CSS, and HTML.

https://jsfiddle.net/

Resource Roundup : JavaScript Debugging

• Debugging JavaScript Crash Course (YouTube)
• Chrome DevTools Guide
• Breakpoints & Watchers in VSCode (Blog)

Interview Question of the Day

Daily Interview Questions

Frontend :
1. What are closures in JavaScript?
2. Difference between == and ===?
3. What is event bubbling?
4. How does hoisting work?

Backend :
1. What is a pointer in C?
2. Differences between malloc and calloc?
3. What is encapsulation in C++?
4. Explain garbage collection in C#.

Database ( SQL ) :
1. What is normalization?
2. Purpose of foreign keys?
3. Difference between DELETE and TRUNCATE?

Others :
1. What is a compiler?
2. Explain CI/CD.

Daily Quiz Challenge

Frontend Quiz :

1. What does === operator check?
• Value only
• Type only
• Value & Type
• Converts to string
2. In JavaScript, typeof null returns:
• "null"
• "undefined"
• "object"
• "boolean"
3. let vs var - main difference?
• Scope
• Speed
• Compatibility
• Output format

Backend Quiz :

1. What is a struct in C?
• Function
• Data container
• Loop type
• Memory block
2. C++ new operator does:
• Calls a function
• Allocates memory
• Deletes memory
• Prints text
3. C# interface keyword defines:
• Inheritance chain
• Method contract
• Memory address
• Static variable

Database :

1. What ensures uniqueness in a column?
• Foreign Key
• Unique Constraint
• Primary Key
• Index

General :

1. Which tool compiles code?
• Browser
• Compiler
• Interpreter
• Linter

Weekly Cross-Domain Activities ( July 04 to July 10, 2025 )

API of the Day:

Task : Build a currency converter using the ExchangeRate-API.

Details :

• Fetch real-time currency conversion rates using https://www.exchangerate-api.com/.
• Allow users to select base and target currencies.
• Display the converted amount dynamically.

Bonus :

• Add error handling for invalid inputs.
• Style it with CSS for a clean look.

Linux/DevOps Tip :

5 commands to monitor system performance:

• top, htop, free -m, df -h, uptime

Real-World Project of the Week ( July 04 to July 10, 2025 )

Project of the Week:

Build a responsive personal portfolio using HTML, CSS, JavaScript, and optionally React.

Collaborative Project:

Contribute to a GitHub open-source project — Suggest projects like https://github.com/firstcontributions/first-contributions

Case Study:

Explore how Netflix uses microservices and scalable cloud infrastructure.