CapitalOne Operations Associate Interview Questions and Answers

Basic python, sql and pandas questions

Q1. Case study (Probability questions)
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Q2. Resume projects
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Test was based on arrays and some dsa concepts.

Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Diff between react and jQuery
Ans. 
React is a modern JavaScript library for building user interfaces, while jQuery is a fast and concise JavaScript library for DOM manipulation.
• React is component-based, promoting reusability and modularity.

• React uses a virtual DOM for efficient updates, while jQuery directly manipulates the DOM.

• React is declarative, making it easier to reason about the UI, while jQuery is imperative.

• React is typically used for single-pa...read more
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