Exterro Interview Questions and Answers

15 -aptitude MCQs
5 -AWS MCQs
5-SQL MCQs
4-SQL queries
pen paper based

We need to excel in both the MCQ test and the group discussion (cumulative assessment). They provided one minute to contemplate the topic and allotted ten minutes for discussion.

Q1. SQL basic questions were asked , literally they concetrated on the communication skills
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Q1. They reviewed communication skills and SQL knowledge
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Q1. Behavioural questions related to the role
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Q1. What is the internal working of HashMap and HashSet? What is the difference between ArrayList and LinkedList? Why is StringBuilder non-synchronized? If there is a bank account service being called multiple...read more
Ans. 
HashMap and HashSet use hashing for fast retrieval, ArrayList uses dynamic array, LinkedList uses linked nodes. StringBuilder is non-synchronized for performance. Synchronized blocks can be used to manage bank account balance.
• HashMap uses key-value pairs and hashing for fast retrieval, while HashSet uses hashing for unique elements.

• ArrayList uses dynamic array for fast random access, while LinkedList uses linked nodes ...read more
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Q2. What is the process to find the first non-repeated character in a string?
Ans. 
Iterate through the string and store the count of each character, then find the first character with count 1.
• Create a hash map to store the count of each character in the string.

• Iterate through the string and update the count in the hash map.

• Iterate through the string again and return the first character with count 1.
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Asking two basic programming questions:
Q1: How can I remove duplicates from the array [1, 1, 10, 9, 7, 9, 3, 4, 5]?

Q1. Tell me about yourself
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Q2. Why did you choose Exterro, and what products do we currently offer?
Ans. 
I chose Exterro for its reputation in providing comprehensive e-discovery and information governance solutions.
• Exterro offers e-discovery software for legal teams to manage electronic data during litigation.

• Exterro also provides information governance solutions to help organizations manage and protect their data.

• Some of the products offered by Exterro include Fusion Platform, Legal Hold, and Data Retention.
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Q3. How can you reverse an array without using any extra swap variables?
Ans. 
Reversing an array without using extra swap variables.
• Use two pointers, one starting from the beginning of the array and the other from the end.

• Swap the elements at the two pointers and move them towards the center until they meet.

• Repeat the process until all elements have been reversed.
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Q4. How can values be inserted into an array at a specified index without altering the existing values? like: a=4,b=1; c=10,d=12; arr=[25,60,12,14,15]; result is like:[25,10,12,14,12,15]
Ans. 
Use the splice method to insert values into an array at a specified index without altering existing values.
• Use the splice method to insert values into the array at the specified index.

• Provide the index where you want to insert the new values, followed by 0 (to indicate no deletion), and then the values to be inserted.

• Example: arr.splice(1, 0, 10, 12) will insert 10 and 12 at index 1 in the array.
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Q1. Basic details and salary discussion
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Q1. What is the difference between display: None and visibiliy:0;
Ans. 
display: None removes the element from the flow of the document, while visibility: 0 hides the element but still takes up space.
• display: None removes the element from the document flow, making it invisible and not taking up any space.

• visibility: 0 hides the element visually, but it still occupies space in the layout.

• display: None is commonly used to hide elements completely, while visibility: 0 is used to hide elements...read more
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Q2. What is Hoisting in js
Ans. 
Hoisting is a behavior in JavaScript where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q3. Difference between splice and slice
Ans. 
splice is used to add or remove elements from an array, while slice is used to extract a portion of an array without modifying it.
• splice modifies the original array by adding or removing elements, while slice does not modify the original array

• splice returns the removed elements as a new array, while slice returns the extracted elements as a new array

• splice takes in parameters for index, number of elements to remove, an...read more
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Q4. What is a promise why its used
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They help in avoiding callback hell and writing cleaner code.

• Promises have states - pending, fulfilled, or rejected.

• They can be chained using .then() method.

• Example: Fetching data from an API returns a promise that resolves with the data.
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Q5. What is dependency
Ans. 
Dependency is a relationship between two modules where one module depends on the other to function properly.
• In software development, dependencies refer to external libraries or modules that a project relies on to work correctly.

• Dependencies can be managed using package managers like npm or yarn in JavaScript projects.

• Circular dependencies should be avoided as they can lead to runtime errors.
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Q6. Share your screen and sort a array without using in build js methods
Ans. 
Sorting an array without using built-in JS methods
• Create a custom sorting function using a sorting algorithm like bubble sort, selection sort, or insertion sort

• Compare each element in the array and swap them if they are in the wrong order

• Repeat the process until the array is fully sorted
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