Tech Mahindra Software Developer Interview Questions and Answers for Experienced

DRY stands for 'Don't Repeat Yourself', a principle aimed at reducing repetition in code and improving maintainability.

• Encourages code reusability by abstracting common functionality into functions or classes.

• Example: Instead of writing the same validation logic in multiple places, create a single function to handle it.

• Helps in reducing bugs since changes need to be made in only one place.

• Promotes cleaner and more...read more

This program identifies and returns duplicate characters from a given string.

• Use a dictionary to count occurrences of each character.

• Iterate through the string and update the count in the dictionary.

• Extract characters that have a count greater than 1.

• Example: For input 'programming', output should be ['g', 'r'].

Middleware is software that connects different applications or services, facilitating communication and data management.

• Middleware acts as a bridge between different software applications, enabling them to communicate and share data.

• Common types of middleware include message brokers, database middleware, and web servers.

• To implement custom middleware in a web application, define a function that processes requests ...read more

OOPs in PHP stands for Object-Oriented Programming, a programming paradigm that uses objects and classes to organize code.

• OOPs allows for better code organization and reusability

• Key concepts include classes, objects, inheritance, encapsulation, and polymorphism

• Example: class Car { public $color; function drive() { echo 'Driving'; }}

A native module is a module written in the same language as the application it is being used in, providing direct access to platform-specific APIs.

• Native modules are typically written in languages like C, C++, or Objective-C for iOS and Java for Android.

• They are used to access platform-specific features and APIs that are not available in JavaScript.

• Native modules can improve performance and provide more flexibilit...read more

Design patterns are reusable solutions to common software design problems; the Singleton pattern restricts instantiation to one instance.

• Design patterns provide a standard terminology and are best practices for software design.

• The Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Example: A configuration manager that loads settings from a file and should only be in...read more