JOB KHOJO / QUICK REVISIONSmall answers.
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Are strings mutable in JavaScript?
THE SHORT ANSWERNo. Strings are immutable primitives. Methods like toUpperCase, slice and replace never change the original; they return a new string, so you must assign or use the result.
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1,019 questionsJavaScriptClosures, the event loop, this, promises and the core language questions every frontend round asks.Practise topic 628 questionsTypeScriptTypes, interfaces, generics and safe patterns for real codebases.Practise topic 1,016 questionsPythonLists, dictionaries, generators, decorators and the Python questions asked in service-company and data roles.Practise topic 867 questionsJavaCollections, the JVM, strings, exceptions and threads, the backbone of most campus placement rounds.Practise topic 944 questionsReactRendering, state, hooks, keys and effects, explained with small examples.Practise topic 1,000 questionsNode.jsThe event loop on the server, streams, modules and building APIs with Express.Practise topic 671 questionsData Structures & AlgorithmsArrays, linked lists, hashing, trees and patterns, with line-by-line code and complexity.Practise topic 889 questionsObject-Oriented ProgrammingThe four pillars, interfaces, abstract classes and design basics.Practise topic 772 questionsOperating SystemsProcesses, threads, scheduling, memory and deadlocks, in plain words.Practise topic 819 questionsComputer NetworksWhat happens when you open a website, TCP vs UDP, DNS and HTTP.Practise topic 957 questionsSQL & DBMSJoins, keys, normalisation, indexes and transactions for placement and backend interviews.Practise topic 951 questionsPostgreSQLIndexes, EXPLAIN, transactions and isolation, JSONB and the Postgres specifics backend interviews probe.Practise topic 978 questionsAWS & CloudEC2, S3, Lambda, IAM and VPC basics, with when to pick which service.Practise topic 1,150 questionsDocker & KubernetesImages, containers, Dockerfiles, pods and deployments, from first principles.Practise topic 1,080 questionsLinux & ShellPermissions, processes, pipes and the commands you are expected to know cold.Practise topic 1,228 questionsGit & GitHubBranching, merge vs rebase, resolving conflicts and pull requests, the way teams actually work.Practise topic 989 questionsData ScienceStatistics, pandas, cleaning data and exploratory analysis for analyst and data science roles.Practise topic 899 questionsMachine LearningSupervised vs unsupervised learning, overfitting, metrics and the classic models, explained simply.Practise topic 985 questionsAI & Generative AILLMs, tokens, embeddings, RAG and prompt engineering, the questions every AI role now asks.Practise topic 1,063 questionsSystem DesignCaching, scaling, databases and classic design problems for beginners.Practise topic 1,753 questionsHR & BehavioralTell me about yourself, strengths, weaknesses and situation questions, with sample answers.Practise topic 1,853 questionsAptitudeQuantitative shortcuts for placement tests: percentages, time and work, and more.Practise topic