CodeClouds Interview Questions, Process, and Tips

Q1. Interface vs abstract class
Ans. 
Interface defines only method signatures while abstract class can have method implementations.
• Interface cannot have constructors while abstract class can.

• A class can implement multiple interfaces but can inherit only one abstract class.

• Abstract class can have non-abstract methods while interface cannot.

• Abstract class can have instance variables while interface cannot.

• Example of interface: Runnable interface in Java.

• Exa...read more
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Q1. I was interviewed on the skills that are mentioned in my resume. It was an easy round. Only basic questions were asked in this round.
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Q2. What is document object model?
Ans. 
Document Object Model (DOM) is a programming interface for web documents.
• DOM is a tree-like structure that represents the HTML or XML document.

• It allows developers to manipulate the content and structure of a web page using programming languages like JavaScript.

• DOM provides a set of methods and properties to access and modify the elements of a web page.

• Changes made to the DOM are reflected in the web page in real-time.

• ...read more
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Q3. Questions on object oriented php
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Q4. MySQL - limit, offset, aggregate functions, where vs having, group_concat vs concat
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Q5. JavaScript - language fundamentals, promise, async await, callback, break vs continue
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Q6. Laravel - request life cycle, dependency injection, explicit vs implicit routing, design patterns
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Q7. Vue - lifecycle hooks, component communications, watch vs computed vs methods
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Q1. Different technical scenario based questions were asked in this round.
Ans. They wanted to hear elaborative answer in this round.
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Q1. Even in HR round technical questions were asked so be prepared to face the challenges.
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Q2. What is ACID property?
Ans. 
ACID property ensures database transactions are reliable and consistent.
• ACID stands for Atomicity, Consistency, Isolation, and Durability.

• Atomicity ensures that a transaction is treated as a single, indivisible unit.

• Consistency ensures that a transaction brings the database from one valid state to another.

• Isolation ensures that concurrent transactions do not interfere with each other.

• Durability ensures that once a tran...read more
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Q3. What is normalization?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and dependency.
• Normalization helps to eliminate data redundancy and inconsistencies.

• It involves breaking down a table into smaller tables and defining relationships between them.

• Normalization is achieved through a series of normal forms, such as first normal form (1NF), second normal form (2NF), and so on.

• Normalization ensures data consi...read more
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General Computer Science Questions.

Q1. 2NF and 3NF difference
Ans. 
2NF eliminates partial dependencies, while 3NF eliminates transitive dependencies.
• 2NF eliminates partial dependencies by ensuring all non-key attributes are fully functionally dependent on the primary key.

• 3NF eliminates transitive dependencies by ensuring that non-key attributes are not dependent on other non-key attributes.

• Example: In a table with columns A, B, and C where A is the primary key, if B depends on A and C...read more
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Q2. Alternative of using loop to print 1 to 100
Ans. 
Using recursion to print numbers from 1 to 100 without a loop
• Create a recursive function that takes a number as input and prints it

• Call the function with 1 as the initial input and increment the input by 1 in each recursive call

• Stop the recursion when the input reaches 100
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Q3. Delete and Truncate Difference
Ans. 
Delete removes rows from a table while truncate removes all rows from a table.
• Delete is a DML command while truncate is a DDL command.

• Delete operation can be rolled back while truncate operation cannot be rolled back.

• Delete operation fires triggers on each row deletion while truncate operation does not fire triggers.
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Q1. Basic questions on Core PHP, Laravel, MySql and jQuery.
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Q1. Advanced questions on core php, laravel, wordpress, mysql, jqyery.
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MCQs on core php and laravel. It was quite hard and confussing.

Q1. Normal communications
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Q1. Which data structure is used to reverse an array?
Ans. 
The data structure used to reverse an array is a stack.
• A stack data structure can be used to reverse an array by pushing each element onto the stack and then popping them off in reverse order.

• Example: If we have an array of strings ['apple', 'banana', 'cherry'], we can reverse it using a stack to get ['cherry', 'banana', 'apple'].
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