HCLTech Senior Cloud Engineer Interview Questions and Answers

let vs var in JavaScript and hosting

• let has block scope while var has function scope

• let cannot be redeclared in the same scope while var can

• Hosting is the process of moving a website or application to a server

• JavaScript can be hosted on various platforms such as AWS, Heroku, and Firebase

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.

• Start from the first element and compare it with the next element

• If the next element is smaller, swap them

• Repeat this process for all elements in the array

• Continue this process until no more swaps are needed

A program to print all prime numbers

• Take input from user for range of numbers

• Loop through the range and check if each number is prime

• Print the prime numbers

Hashmap is a data structure that stores key-value pairs and allows constant time access to values based on their keys.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Examples of hashmap implementations include Java's HashMap class and Python's dict type.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add new properties and methods.

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A table in SQL is a collection of related data organized in rows and columns.

• Tables are used to store data in a structured way.

• Each table has a unique name and consists of columns and rows.

• Columns define the type of data that can be stored in them.

• Rows represent individual records in the table.

• Tables can be queried using SQL commands to retrieve, insert, update or delete data.