10+ Easy Design Systems Interview Questions and Answers

Hashmap search has constant time complexity O(1) due to its use of hash function and index-based storage.

• Hashmap uses a hash function to generate a unique index for each key-value pair

• This index is used to directly access the value in the underlying array

• As long as the hash function is well-designed and the array is large enough, search time remains constant

• Example: searching for a value with key 'John' in a hashmap of 1000 entries takes the same time as searching in a hashma...read more

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types.

• Examples include method overloading and method overriding in object-oriented programming.

Real-life examples and code for Technology Trainee interview question.

• Example 1: Creating a simple calculator app in Python

• Example 2: Implementing a basic chatbot using JavaScript

• Example 3: Developing a website using HTML, CSS, and JavaScript

Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.

• Allows for code reusability and promotes the concept of hierarchical classification

• Derived class inherits properties and behaviors of the base class

• Types of inheritance include single, multiple, multilevel, and hierarchical inheritance

Implement DeQueue using arrays in a programming language

• Create an array to store the elements of the DeQueue

• Implement functions to add elements at both ends of the DeQueue

• Implement functions to remove elements from both ends of the DeQueue

• Ensure proper handling of empty DeQueue and full DeQueue scenarios