Daily Coding Challenges & Projects

Frontend Mini Project Challenge

Focus : Vue.js Components

Small Challenge ( Vue.js ) :

Create a reusable ToggleButton.vue component that:

• Accepts a label prop
• Toggles between ON and OFF
• Emits an event when state changes

Constraints :

• Use Vue 3 Composition API
• No external UI libraries
• Button text must animate on change

Expected Concepts Covered :

• props
• emit
• ref
• computed
• Component reusability

Backend Challenge

Language Focus : Python + PHP

Write a function that:

• Accepts a log file
• Extracts IP addresses
• Returns the top 3 most frequent IPs

Constraints: :

• File may be >1GB
• Cannot load fully into memory

PHP Challenge :

Build a script that:

• Accepts a JSON API response
• Flattens all nested arrays
• Stores output in a MySQL table

Edge Case :

• API response may contain empty nodes or mixed types

Database Query Challenge

Problems on SQL - HR Database :

1. Find all employees who:
• Have changed jobs at least twice
• And currently earn more than the average salary of their department
2. Find departments where:
• Every employee has at least one dependent
• And the total department salary exceeds ₹10,00,000

Data Structures & Algorithms Challenge

• Easy :
• Problem : Check if a number is a Harshad (Niven) number
• Hint : Sum of digits divides the number.
• Medium :
• Problem : Find the first non-repeating character in a string.
• Hint : Use frequency count + second traversal.
• Hard :
• Problem : Given a matrix, find the maximum sum submatrix.
• Hint : Extended Kadane’s Algorithm on compressed rows.

Bug of the Day

Language Focus : Python & PHP

Buggy Code ( Python ) :

nums = [1, 2, 3, 4]
print(nums.append(5))

Bug : Prints None

Challenge : Explain why and fix it.

Buggy Code ( PHP ) :

$arr = ["10", "20", "30"];
echo array_sum($arr);

Bug :Works but causes logical errors in strict typing

Challenge :Fix safely with proper casting.

📋 Daily Micro-Project

Focus : DATABASE

Project :

Query Performance Analyzer

Build a system that :

• Logs slow SQL queries
• Stores execution time
• Flags queries >500ms
• Generates a weekly report

Concepts :

• Indexing
• Query execution plans
• Performance optimization

Trivia: 5 Fun Facts

1. Python is named after Monty Python, not the snake.
2. The first computer bug was a real moth (1947).
3. Java was originally named Oak.
4. The first website is still online (by Tim Berners-Lee).
5. PHP originally stood for Personal Home Page.

Tool & Resource of the Day

Tool : Postman

• API testing
• Automated request workflows
• Environment variables

Resource Roundup :

• Vue.js Official Documentation
• Python Performance Optimization Guide
• Free SQL Optimization Cheat Sheet
• PHP Security Best Practices (OWASP)

Interview Question of the Day

Daily Interview Questions

Frontend ( Vue Focus ) :
1. Difference between ref() and reactive() in Vue 3?
2. What are Vue lifecycle hooks?
3. Difference between watch and computed?
4. How does virtual DOM work in Vue?

Backend ( Python & PHP ) :
1. Difference between @staticmethod and @classmethod?
2. What is Python’s GIL?
3. Difference between require and include in PHP?
4. How does PHP handle sessions?

Database :
1. Difference between clustered and non-clustered index?
2. When does a full table scan occur?
3. What is query normalization?

Others :
1. What is deadlock in an OS?
2. Difference between virtualization and containerization?

Daily Quiz Challenge

Frontend ( Vue & JS) :

1. Which directive is used for two-way binding in Vue?
2. What does v-if do?
3. Which hook runs after component mount?

Backend ( Python & PHP ):

1. Which keyword is used to define a generator in Python?
2. Which PHP function safely escapes SQL input?
3. What does __init__ do?

Database :

1. Which SQL keyword is used to remove duplicates?

Other Tech :

1. What is a context switch?

Mixed Quiz :

1. Frontend :What is the output of typeof null?
2. Backend :What is a Python lambda function?
3. Database :What does GROUP BY do?

Weekly Cross-Domain Activities ( December 06 to December 12, 2025 )

API of the Day:

Integrate OpenWeatherMap API

• Build /weather?city=
• Show temperature, humidity, conditions.

Linux / DevOps Tip :

10 commands to monitor server health :

top, htop, df -h, du -sh, ps aux, systemctl status, journalctl, iostat, free -m, uptime. 

Real-World Project of the Week ( December 06 to December 12, 2025 )

Project of the Week:

Build a Full Authentication System (frontend + backend + JWT).

Collaborative Project :

Contribute to an open-source:

Awesome-Dev-Templates GitHub repo.

Case Study :

Study how Twitter handles real-time updates (WebSockets, queues, caching).