DE Shaw Sdet Automation Test Engineer Interview Questions and Answers

Frequency array, java collection, missing number

General apptitude and 2 easy coding questions.

Q1. What polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal class with methods eat() and sleep(). Dog and Cat classes can override these methods to have t
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Q2. What is virtualization
Ans. 
Virtualization is the process of creating a virtual version of a device or resource, such as a server, storage device, network or operating system.
• Virtualization allows multiple virtual instances to run on a single physical machine

• It helps in optimizing resources and increasing efficiency

• Examples include VMware, VirtualBox, and Hyper-V
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Q1. What is React Context?
Ans. 
React Context is a feature in React that allows data to be passed down the component tree without having to pass props manually.
• Context provides a way to share values like themes, user data, etc. across the component tree.

• It avoids prop drilling, where props are passed down multiple levels to reach a component that needs them.

• Context consists of two parts: a Provider component that provides the data and a Consumer comp...read more
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Q2. What is meant by closure in javascript?
Ans. 
Closure is a function that has access to its parent scope, even after the parent function has closed.
• Closure is created when a function is defined inside another function.

• The inner function has access to the outer function's variables and parameters.

• The outer function returns the inner function, which can be called later with the parent scope still accessible.

• Closures are used for data privacy, event handlers, and call
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Q3. What are the complicated tasks you've done exceeding everyone's expectation?
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Q4. Algorithm to convert roman numeral to numbers?
Ans. 
Algorithm to convert roman numeral to numbers
• Create a dictionary to map roman numerals to their corresponding values

• Iterate through the roman numeral string from right to left

• If the current value is less than the previous value, subtract it from the total

• If the current value is greater than or equal to the previous value, add it to the total

• Return the total
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Q1. What is React context?
Ans. 
React context is a way to pass data through the component tree without having to pass props down manually at every level.
• Context provides a way to share values like a theme or user data across the component tree.

• It avoids prop drilling and makes the code cleaner and more maintainable.

• Context consists of two parts: a Provider component that provides the data and a Consumer component that consumes the data.

• Context can be...read more
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Q2. What is abstract class in javascript?
Ans. 
There is no abstract class in JavaScript.
• JavaScript does not have a built-in abstract class concept.

• However, it is possible to create abstract classes using functions and prototypes.

• Abstract classes are used as blueprints for other classes to inherit from.

• They cannot be instantiated on their own and must be extended by a subclass.

• Abstract methods can be defined in the abstract class and must be implemented in the subcl
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Q3. What is meant by function overloading and function overriding?
Ans. 
Function overloading is when multiple functions have the same name but different parameters. Function overriding is when a subclass provides its own implementation of a method that is already present in the parent class.
• Function overloading is used to provide multiple ways to call a function with different parameters.

• Function overriding is used to provide a specific implementation of a method in a subclass.

• Function ove...read more
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Q4. Implement counter in react app
Ans. 
Implement a counter in a React app
• Create a state variable to hold the count

• Render the count in the UI

• Add buttons to increment and decrement the count

• Update the state variable on button click
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Q1. Java OOPS Questions
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Q2. Coding Questions
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Q1. Reverse string maintaining space
Ans. 
Reverse a string while maintaining the position of spaces.
• Iterate through the string and store the positions of spaces in an array.

• Reverse the string without considering spaces.

• Insert spaces back into their original positions using the array of space positions.
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Q1. Write a code to find vowel in given string.
Ans. 
Code to find vowels in a given string
• Iterate through each character in the string

• Check if the character is a vowel (a, e, i, o, u)

• Count the number of vowels found in the string
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Q2. Explain your framework
Ans. 
My framework is a data-driven framework using Selenium WebDriver and TestNG for automated testing.
• Data-driven approach for test data separation

• Utilizes Selenium WebDriver for browser automation

• Integration with TestNG for test execution and reporting

• Modular design for easy maintenance and scalability
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Frequency array, java collection, missing number