Decathlon Test Engineer Interview Questions and Answers

Mostly on js basics. Event loop, hoisting, GraphQL

Q1. How to implement Cadence algorithm
Ans. 
Cadence algorithm is used for real-time stream processing of data.
• Cadence is a distributed system for managing workflows.

• It uses a programming model called the Cadence Workflow Model.

• The Cadence server is responsible for managing the state of workflows.

• The Cadence client is responsible for executing the workflow tasks.

• Cadence provides a lot of features like retries, timeouts, and error handling.
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Q2. How does vdom works in react
Ans. 
VDOM stands for Virtual Document Object Model, which is a lightweight copy of the actual DOM used by React for efficient rendering.
• VDOM is a tree-like structure that React uses to keep track of changes in the UI.

• When a component's state changes, React creates a new VDOM tree and compares it with the previous one to identify the changes.

• React then updates only the parts of the actual DOM that need to be changed, resulti...read more
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Arrays , Strings Basic Data Structures

Q1. React js questions like Dom manipulation, useCallback and useMemo these kind of questions
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Q2. Create some dynamic buttons with a json data and whenever you click on that you need to maintain active and inactive states and also you need to show the content of the button based on the json data whenev...read more
Ans. 
Create dynamic buttons with JSON data, maintain active/inactive states, and show content on click
• Create buttons dynamically using JSON data

• Toggle between active and inactive states on click

• Display button content based on JSON data on click
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Q1. More advanced react based questions like test cases handling and redux state management techniques
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Q2. Prop drilling concepts
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Q1. More about your projects you have worked on and also front end technical basic questions
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Q1. Why Lowe's only
Ans. 
Lowe's is a leading home improvement retailer with a strong focus on technology and innovation.
• Lowe's has a strong reputation for investing in technology and innovation within the home improvement industry.

• I am impressed by Lowe's commitment to digital transformation and their use of cutting-edge tools and technologies.

• I believe Lowe's offers a challenging and rewarding environment for software engineers to grow and de...read more
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Q2. What are your expectations here nd all
Ans. 
I expect a challenging work environment, opportunities for growth, and a supportive team.
• Challenging work that allows me to utilize my skills and learn new technologies

• Opportunities for career advancement and professional development

• A supportive team that fosters collaboration and growth

• Clear communication and expectations from management
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Q1. Delete a node from a bst
Ans. 
To delete a node from a binary search tree (BST), we need to handle three cases: node has no children, node has one child, and node has two children.
• Start at the root and traverse the tree to find the node to be deleted.

• Handle the three cases: node has no children, node has one child, and node has two children.

• For a node with two children, find the inorder successor (smallest node in the right subtree) to replace the n
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Q2. DP based question
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Q1. Immutable Class, Remove duplicates from string using java 8
Ans. 
Immutable class, remove duplicates from string using Java 8
• Create an immutable class to represent the string

• Use Java 8 streams to remove duplicates from the string

• Convert the string to a character array, use distinct() and collect() to remove duplicates
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Q2. Sealed classes in java
Ans. 
Sealed classes in Java restrict inheritance to a predefined set of subclasses.
• Sealed classes were introduced in Java 15 to restrict inheritance to a predefined set of subclasses.

• Subclasses of a sealed class must be declared in the same file as the sealed class.

• Sealed classes are declared using the 'sealed' modifier before the 'class' keyword.

• Example: sealed class Shape permits Circle, Square, Triangle;
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Q1. Fallout Mechanism between the microservices
Ans. 
Fallout mechanism between microservices refers to how failures in one microservice can impact other microservices.
• Fallout can occur due to cascading failures when one microservice depends on another.

• Implementing circuit breakers can help prevent fallout by isolating failures.

• Monitoring and alerting systems are crucial for detecting and responding to fallout.

• Using asynchronous communication can reduce the impact of fall...read more
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