Zellers Senior Software Engineer Interview Questions and Answers

Print nodes of n-ary tree in arc wise manner from outside

• Traverse the tree level by level from outside to inside

• Use a queue to keep track of nodes at each level

• Print the nodes at each level in a clockwise or anticlockwise manner

React is a JavaScript library for building user interfaces, known for its efficiency and flexibility.

• React allows for the creation of reusable UI components, making development faster and more efficient.

• It uses a virtual DOM for optimal performance by only updating the necessary components when data changes.

• React's component-based architecture promotes code reusability and maintainability.

• It has a large and active comm...read more

I have extensive experience with various design patterns such as Singleton, Factory, Observer, and MVC.

• Implemented Singleton pattern to ensure only one instance of a class exists

• Utilized Factory pattern to create objects without specifying the exact class

• Implemented Observer pattern for event handling and notifications

• Utilized MVC pattern for separating concerns in a software application

AB framework is a system for testing two versions of a software application to determine which performs better.

• Define the goals and metrics for comparison

• Create two versions of the software with the only difference being the feature being tested

• Randomly assign users to either version A or version B

• Collect and analyze data on user behavior and performance to determine which version is more effective