Lucent Innovation Interview Questions and Answers

A online platform was given along with timer. There were 25 aptitude questions with negative marking.

A basic coding question was given

Q1. Convert decimal to binary without using inbuilt functions.
Ans. 
Convert decimal to binary without using inbuilt functions
• Create an empty array to store binary digits

• Use a while loop to divide the decimal number by 2 and store the remainder in the array

• Reverse the array to get the binary representation
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Q2. Find all possible duplicate elements in array
Ans. 
Use a hash map to find duplicate elements in an array of strings.
• Create an empty hash map to store elements and their frequencies.

• Iterate through the array and for each element, check if it exists in the hash map. If it does, increment its frequency. If not, add it to the hash map.

• After iterating through the array, filter out elements with frequency greater than 1 to find duplicates.
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Q1. What is closures
Ans. 
Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures allow functions to access variables from their parent function even after the parent function has returned.

• They help in maintaining state in JavaScript.

• Closures are created whenever a function is defined within another function.
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Q2. What is promises
Ans. 
Promises in Node.js are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in a more readable and manageable way.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained together using .then() to handle success or failure.

• They help avoid callback hell and make code more maintainable.

• Example: const my...read more
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Q3. What are callbacks
Ans. 
Callbacks are functions passed as arguments to other functions, to be executed later.
• Callbacks are commonly used in asynchronous programming in Node.js.

• They allow functions to be executed after another function has finished its execution.

• Callbacks can be used to handle events, make API calls, or perform other tasks asynchronously.

• Example: fs.readFile('file.txt', (err, data) => { console.log(data); });
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Q4. What is hoisting in JS
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.
• Variable and function declarations are hoisted to the top of their scope during the compilation phase.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.
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Q5. Nodejs basic questions
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Q1. What are closures in JavaScript?
Ans. 
Closures are functions that retain access to their lexical scope, even when executed outside that scope.
• A closure is created when a function is defined inside another function.

• Closures can access variables from their parent function's scope.

• They help in data encapsulation and maintaining state.

• Example: function outer() { let count = 0; return function inner() { count++; return count; }; }

• Closures are commonly used in c...read more
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Q2. What are the types of variables in JavaScript?
Ans. 
JavaScript has three main types of variables: var, let, and const, each with different scopes and mutability.
• var: Function-scoped or globally-scoped. Example: var x = 10;

• let: Block-scoped and can be updated. Example: let y = 20;

• const: Block-scoped and cannot be reassigned. Example: const z = 30;
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Q1. Your Internship Experience?
Ans. 
I had a 6-month internship at XYZ Company where I gained valuable experience in business development.
• Worked closely with the sales team to identify potential clients and develop strategies to attract them

• Conducted market research to identify new business opportunities

• Assisted in creating marketing materials and presentations for client meetings

• Participated in meetings with clients to understand their needs and provide ...read more
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Q1. How do you manage your client expectations?
Ans. 
Managing client expectations involves clear communication, setting realistic goals, and regular updates.
• Establish open and honest communication with clients

• Clearly define project scope, timeline, and deliverables

• Set realistic goals and manage client expectations accordingly

• Regularly update clients on progress and any changes

• Address any concerns or issues promptly and professionally

• Provide clear and transparent feedback

• ...read more
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