Daily Coding Challenges & Projects

Frontend Mini Project Challenge

Theme : Vue.js Components

Challenge :

Build a Vue.js component called <StarRating> that allows users to rate an item from 1 to 5 stars. The stars should be clickable, and the selected rating should be highlighted.

Bonus : Emit the selected rating to the parent component.

Playground : Try it on CodeSandbox (link placeholder)

Backend Challenge

Language Focus : Python & PHP

Python Challenge

Task : Write a Python function to compress a string using run-length encoding.

Example :

"aaabbc" → "a3b2c1"

PHP Challenge

Task : Create a simple login system using PHP that checks a hardcoded username/password.

Bonus : Use sessions to keep the user logged in.

Database Query Challenge

Problems on SQL - HR Database :

1. Find all employees who joined in the last 6 months.
2. Find employees who haven’t received a salary increase in the last 2 years.

Data Structures & Algorithms Challenge

• Easy:
• Problem :Find the second largest number in an array.
• Hint :Track the top two values while iterating.
• Medium:
• Problem : Implement a LRU (Least Recently Used) cache.
• Hint :Use a HashMap with a Doubly Linked List.
• Hard:
• Problem :Given an array of integers, find the length of the longest increasing subsequence.
• Hint :Use dynamic programming with binary search.

Bug of the Day

Language Focus : Python

Python Bug

Buggy Code:

def multiply(a, b):
    return a * b
print(multiply("3", 4))  # Expected 12

Challenge : What’s the output? Why is it incorrect? Fix it to get the actual multiplication result.

📋 Daily Micro-Project

Type : Database

Task :

Optimize a SQL query that fetches employee details with department and salary using proper indexing and JOIN.

Before :

SELECT * FROM employees, departments WHERE employees.dept_id = departments.id;

Improved :

SELECT e.name, d.department_name
FROM employees e
JOIN departments d ON e.dept_id = d.id;
-- Add INDEX on dept_id for performance

Trivia: 5 Fun Facts

1. Who created the Python programming language?
2. What year was Vue.js released?
3. What is the mascot of PHP?
4. Which Python keyword is used for defining anonymous functions?
5. Who invented the relational database model?

Tool & Resource of the Day

Tool : Postman

Use : Test your APIs with ease. Allows automated testing, environment variables, and sharing with teams.

Bonus Resource : Postman Learning Center

Interview Question of the Day

Daily Interview Questions

Frontend :
1. What are Vue.js watchers, and when should you use them?
2. Compare v-if vs v-show in Vue.js.
3. How does Vue’s reactivity system work?
4. What’s the role of key in v-for?

Backend :
1. What is the GIL (Global Interpreter Lock) in Python?
2. How does PHP handle sessions?
3. What is a virtual environment in Python?
4. How do you manage dependency injection in PHP?

Database :
1. What is a foreign key in SQL?
2. How does normalization reduce redundancy?
3. What is ACID in databases?

Others :
1. What is cron in Linux systems?
2. Define the concept of middleware in web development.

Daily Quiz Challenge

Frontend ( Vue.js Focus ) :

1. What directive is used for two-way data binding in Vue.js?
• v-bind
• v-model
• v-for
• v-if
2. Which Vue lifecycle hook is called after the component is mounted?
• created
• beforeMount
• mounted
• updated
3. What is the purpose of computed properties in Vue.js?
• Perform API calls
• Bind to HTML
• Cache expensive calculations
• Add animations

Backend ( Python/PHP ) :

1. What is the output of print("2" * 3) in Python?
• 6
• 222
• Error
• 2 * 3
2. In PHP, which of the following is used to start a session?
• session_begin()
• start_session()
• session_start()
• init_session()
3. Which Python keyword is used for exception handling?
• try...except
• if...else
• loop
• raise...catch

Others :

1. Which SQL clause is used to group rows that have the same values?
• ORDER BY
• WHERE
• GROUP BY
• HAVING
2. What does REST stand for in web APIs?
• Remote Execution Secure Transfer
• Representational State Transfer
• Run External Script Transfer
• Recursive Secure Transaction

Weekly Cross-Domain Activities ( August 01 to August 07, 2025 )

API of the Day:

Build a crypto tracker using the CoinGecko API.

Display current prices and 24h change of selected coins.

Linux/DevOps Tip :

Top 10 htop features for server monitoring (process tree, CPU graph, filter by user, etc.)

Real-World Project of the Week ( August 01 to August 07, 2025 )

Project of the Week:

Build a Task Manager App with React + Node.js + MongoDB (MERN Stack)

Collaborative Project:

Create an Open Source GitHub repo for “Interview Prep Hub” – collect user-submitted questions and answers.

Case Study:

Explore how Notion manages blocks and rich content – replicate a basic block-based note editor with contenteditable elements.