BT Group Front Office Executive Interview Questions and Answers

Q1. Difference between `const`, `let` and `var`
Ans. 
const, let, and var are used to declare variables in JavaScript, but they have different scopes and behaviors.
• const: used for variables that should not be reassigned, but the value can still be mutated (e.g. object properties)

• let: used for variables that can be reassigned within their scope

• var: function-scoped variable declaration, can be reassigned and hoisted
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Q2. What is hoisting in JavaScirpt
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable declarations are hoisted but not their initializations.

• 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. What are closures in JavaScript?
Ans. 
Closures in JavaScript 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 creating private variables and data encapsulation.

• Closures are commonly used in event handlers, callbacks, and in creating modules.

• Example: function o...read more
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Q4. Given an array of strings, how would you check if there are duplicate strings? How would you remove the duplicate strings?
Ans. 
To check for duplicate strings in an array, use a Set data structure. To remove duplicates, convert the array to a Set and then back to an array.
• Create a Set from the array to automatically remove duplicates

• Check if the size of the Set is equal to the size of the original array to determine if there are duplicates

• Convert the Set back to an array to get the array without duplicates
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Q5. What are Primitives in JavaScript?
Ans. 
Primitives in JavaScript are data types that are not objects and do not have methods.
• Primitives include strings, numbers, booleans, null, and undefined.

• They are immutable and passed by value.

• Examples: 'hello', 42, true, null, undefined.
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Time base directions and probability

Q1. Self-introduction of yourself
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Q2. Job description of the company why you need tp work in this company
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Q1. Tell me about your self
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What is react , feature, axios, API

Redux Redux toolkit Redux thunk

Q1. About my information
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Q2. About my self and work experience
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Q3. Hobbies and weakness
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Q4. Strength about my self
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Sharing data and parents is an essential parts

Q1. About an experience and knowledge when you faced difficulty at work while working on a project
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A group discussion is a discussion between a group of participants on a given subject. A group discussion typically forms a part of the selection process used by organizations and education institutions. The candidates talk about the given topics to present facts, opinions and conclusions.

2 question 1 easy 2 medium dsa

2 codes of dsa and mcq.

Q1. Code paring round
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Q2. Dsa question of graph
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Q1. Introduce yourself
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Q2. What's your family background
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Q3. Something tell me about our organisation
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Q1. What's your salary expectation
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Q2. After 5 years where you see if yourself
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Q3. Why you searching for another jobs
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