Lucent Innovation Interview Questions and Answers

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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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 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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