TCS Programmer Analyst Interview Questions and Answers

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
Ans. 
Concatenating two arrays combines their elements into a single array, preserving the order of elements from both arrays.
• Use the `concat` method: `let result = array1.concat(array2);`

• Spread operator: `let result = [...array1, ...array2];`

• Example: `let arr1 = ['a', 'b']; let arr2 = ['c', 'd']; let result = arr1.concat(arr2); // ['a', 'b', 'c', 'd']`
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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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