TCS Programmer Analyst Interview Questions, Process, and Tips

Q1. Difference between let and const in javascript
Ans. 
let is mutable and can be reassigned, const is immutable and cannot be reassigned
• let allows reassignment of values, const does not

• const must be initialized with a value at declaration, let can be declared without a value

• const is block-scoped, let is function-scoped
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Q2. Map() uses
Ans. 
map() is a higher-order function in JavaScript used to transform elements of an array.
• map() takes a callback function as an argument and applies it to each element of an array, returning a new array with the results.

• It does not mutate the original array, but creates a new one.

• Example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); // doubled is [2, 4, 6]
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Q3. Concat 2 arrays
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Q1. What is a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node contains a data field and a reference to the next node.
• Consists of nodes connected by pointers/references

• Does not have a fixed size like an array

• Can easily insert or delete elements without shifting other elements

• Example: Singly linked list, Doubly linked list
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Q1. Write a Bubble Sort program
Ans. 
Bubble Sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order.
• Initialize an array of strings to be sorted

• Repeat until no swaps are needed: Compare adjacent elements and swap if necessary

• Continue until the array is sorted in ascending order
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Q1. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• 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: Inheritance in object-oriented programming languages like Java allows for polymorphism.
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It is totally depends on basic concepts and mathematics

Q1. It is our interview round.it is very easy.you prepare with your resume.
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Q2. What is your Favourite subject? What is your role of responsibility?
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