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bongoDev | JavaScript Hands-On Learning Pro — Zero to Intermediate in 30 Days - Knowledge Hub

Knowledge Hub/JavaScript Hands-On Learning Pro — Zero to Intermediate in 30 Days

Englishবাংলা

Learning path

JavaScript Hands-On Learning Pro — Zero to Intermediate in 30 Days

A self-guided 30-day hands-on JavaScript path from fundamentals to intermediate engineering: modern ECMAScript ES2015+, browser and Node.js runtimes, modules, npm, asynchronous programming, debugging, testing, secure and robust coding, and progressive real-world projects.

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৳ 320.00৳ 120.00Save ৳ 200.00

Lessons

86 published lessons · 1 free preview

01Your 30-Day JavaScript Learning System: Read, Predict, Run, Break & FixBuild a repeatable daily study loop and learn JavaScript by producing evidence, not by passively reading.Beginner · 28 min readFree previewFree preview
02JavaScript vs ECMAScript vs Browser vs Node.jsUnderstand the language specification and the runtime APIs that surround JavaScript.

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03Install Node.js, Verify the Runtime & Use the REPLVerify Node.js/npm and use the REPL for fast experiments before writing files.Beginner · 28 min readLockedLocked

04Editor, DevTools, Terminal & Project LayoutCreate a clean learning workspace and understand source files, terminal output and browser DevTools.Beginner · 28 min readLockedLocked

05Statements, Expressions, Comments & Your First ScriptDistinguish expressions from statements and write readable executable JavaScript.Beginner · 28 min readLockedLocked

06Variables: `const`, `let`, `var` & MutationChoose `const` by default, use `let` for intentional reassignment, and understand why `var` behaves differently.Beginner · 28 min readLockedLocked

07Primitive Values, `typeof`, `null` & `undefined`Recognize JavaScript primitive values and reason about missing, empty and intentionally-null data.Beginner · 28 min readLockedLocked

08Numbers, `Math`, `NaN`, Infinity & BigIntPerform numeric calculations safely and recognize special numeric values.Beginner · 28 min readLockedLocked

09Strings, Template Literals & Unicode-Aware ThinkingBuild readable strings, interpolate values and avoid assuming visible characters equal code units.Beginner · 28 min readLockedLocked

10Conversion, Coercion, `===` vs `==` & Truthful TypesConvert external input intentionally and avoid surprising implicit coercion.Beginner · 28 min readLockedLocked

11Operators, Precedence & Short-Circuit EvaluationUse arithmetic, comparison and logical operators while making evaluation order explicit.Beginner · 28 min readLockedLocked

12Truthy/Falsy Values, `if` / `else if` / `else`Write clear branches and understand which values JavaScript treats as false.Beginner · 28 min readLockedLocked

13`switch` & Explicit State HandlingUse `switch` when a value maps to a finite set of explicit states.Beginner · 28 min readLockedLocked

14Arrays: Ordered Collections & Safe UpdatesStore ordered values, read/update elements and distinguish mutation from copying.Beginner · 28 min readLockedLocked

15Objects: Model Real Engineering DataRepresent named properties and safely read, update and enumerate object data.Beginner · 28 min readLockedLocked

16Nested Data, Optional Fields & Defensive AccessNavigate nested arrays/objects and protect code from missing intermediate values.Beginner · 28 min readLockedLocked

17Loops: `for`, `while`, `break` & `continue`Repeat work intentionally and stop/skip iterations without losing control flow clarity.Beginner · 28 min readLockedLocked

18`for...of`, `for...in`, `Object.entries()` & `enumerate` ThinkingChoose iteration syntax based on whether you need values, property names or key/value pairs.Beginner · 28 min readLockedLocked

19Array Methods: `map`, `filter`, `find`, `some` & `every`Transform, select and query collections without manual accumulator loops.Beginner · 28 min readLockedLocked

20Week 1 Project: System Health EvaluatorCombine variables, arrays, objects, conditions and loops into a small real-world health evaluator.Beginner · 28 min readLockedLocked

21Functions: Declarations, Expressions & First-Class ValuesPackage behavior into reusable functions and treat functions as values.Beginner · 32 min readLockedLocked

22Arrow Functions & Lexical `this`Use concise arrow functions while understanding their lexical `this` behavior.Beginner · 32 min readLockedLocked

23Parameters, Defaults, Rest & SpreadDesign flexible function interfaces using defaults, rest parameters and spread syntax.Beginner · 32 min readLockedLocked

24Return Values, Scope & ClosuresControl data flow with return values and understand how closures retain lexical state.Beginner · 32 min readLockedLocked

25Destructuring, Property Shorthand & Computed PropertiesWrite concise data extraction and construction while keeping names meaningful.Beginner · 32 min readLockedLocked

26Optional Chaining & Nullish CoalescingHandle optional nested data without incorrectly replacing valid falsy values.Beginner · 32 min readLockedLocked

27`Map` & `Set`: Keyed Collections and UniquenessUse Map for explicit key/value collections and Set for uniqueness.Beginner · 32 min readLockedLocked

28`reduce`, Sorting, `flatMap` & Mutation AwarenessAggregate collections and avoid accidental mutation during sorting/transformations.Beginner · 32 min readLockedLocked

29Week 2 Project: Server Inventory ManagerCombine collections, functions, modules-ready design and JSON-shaped data into an inventory report.Beginner · 32 min readLockedLocked

30Browser DOM: Select, Read & Update the PageManipulate browser documents safely using DOM APIs rather than string guessing.Intermediate · 32 min readLockedLocked

31Browser Events, Forms & User InputRespond to browser events and validate form input before using it.Intermediate · 32 min readLockedLocked

32Safe Browser Rendering: Text vs HTMLRender untrusted text without accidentally interpreting it as executable markup.Intermediate · 32 min readLockedLocked

33Browser `fetch`: HTTP, JSON & Failure ChecksCall HTTP APIs from the browser and separate network failures from non-2xx HTTP responses.Intermediate · 32 min readLockedLocked

34Browser Storage: `localStorage`, `sessionStorage` & Data BoundariesPersist small client-side preferences while recognizing security and lifecycle boundaries.Intermediate · 32 min readLockedLocked

35Browser Project: Production Service DashboardCombine DOM, events and fetch into a small browser dashboard backed by a local Node.js API.Intermediate · 32 min readLockedLocked

36ES Modules: `import`, `export` & Module BoundariesSplit code into explicit modules with named/default exports and predictable dependencies.Intermediate · 32 min readLockedLocked

37ES Modules vs CommonJS in Node.jsRecognize ESM and CommonJS syntax and avoid mixing module systems accidentally.Intermediate · 32 min readLockedLocked

38`package.json`, `npm init` & Project MetadataUnderstand the Node package manifest and define scripts/module mode deliberately.Intermediate · 32 min readLockedLocked

39npm Dependencies vs Dev DependenciesInstall packages into the correct dependency class and audit why the project needs each one.Intermediate · 32 min readLockedLocked

40Semantic Versioning, `package-lock.json` & `npm ci`Understand version ranges, lock files and reproducible installation in CI.Intermediate · 32 min readLockedLocked

41npm Scripts, `npx`/`npm exec` & Repeatable ToolingTurn project commands into named, repeatable workflows rather than personal shell memory.Intermediate · 32 min readLockedLocked

42Node Core Modules: `fs`, `path`, `process` & `URL`Use built-in Node functionality before reaching for third-party packages.Intermediate · 36 min readLockedLocked

43Files & JSON with `fs/promises`Read/write files asynchronously and validate JSON-shaped data.Intermediate · 36 min readLockedLocked

44Process Arguments, Standard Streams & Exit CodesBuild command-line tools that communicate through arguments, stdout/stderr and meaningful exit status.Intermediate · 36 min readLockedLocked

45`try` / `catch` / `finally` & Error BoundariesHandle expected failures at useful boundaries and always clean up resources when required.Intermediate · 36 min readLockedLocked

46Custom Errors, `cause` & Failure ContractsCreate meaningful error types and preserve causal context across abstraction layers.Intermediate · 36 min readLockedLocked

47Stack Traces & a Scientific Debugging WorkflowRead stack traces from the bottom-up evidence and form one testable hypothesis at a time.Intermediate · 36 min readLockedLocked

48Browser DevTools Debugging: Sources, Network & StorageUse browser evidence to debug runtime logic, network requests and client-side state.Intermediate · 36 min readLockedLocked

49Node.js Debugging: `debugger`, Inspector & VS CodePause Node execution, inspect local variables and step through asynchronous code.Intermediate · 36 min readLockedLocked

50Structured Logging for JavaScript ApplicationsEmit useful contextual logs without leaking secrets or relying on unstructured print statements.Intermediate · 36 min readLockedLocked

51Callbacks & Inversion of ControlUnderstand callback-based APIs as a foundation for events and asynchronous JavaScript.Intermediate · 36 min readLockedLocked

52Promises: Pending, Fulfilled, Rejected & ChainingRepresent future completion and compose asynchronous work without callback nesting.Intermediate · 36 min readLockedLocked

53`async` / `await`: Readable Asynchronous Control FlowWrite asynchronous code that reads sequentially while preserving Promise semantics.Intermediate · 36 min readLockedLocked

54Async Error Boundaries & Unhandled RejectionsCatch asynchronous failures at the layer that can add context or decide recovery.Intermediate · 36 min readLockedLocked

55Promise Combinators: `all`, `allSettled`, `race` & `any`Choose concurrency semantics based on whether all, some or the first result matters.Intermediate · 36 min readLockedLocked

56Event Loop, Tasks, Microtasks & Execution OrderPredict asynchronous execution order and recognize how synchronous work can block responsiveness.Intermediate · 36 min readLockedLocked

57Sequential vs Concurrent Async WorkRun independent asynchronous work concurrently while preserving ordering where dependencies exist.Intermediate · 36 min readLockedLocked

58Async Iteration & `for await...of`Consume asynchronous iterables and streams incrementally instead of buffering everything.Intermediate · 36 min readLockedLocked

59Node.js `fetch`: Build a Real API ClientUse Node’s web-compatible fetch API to call services, validate status and parse JSON.Intermediate · 36 min readLockedLocked

60Timeouts with `AbortController` & `AbortSignal`Bound network work so a dependency cannot consume unlimited time.Intermediate · 36 min readLockedLocked

61Retries, Exponential Backoff & JitterRetry only transient/idempotent work and prevent synchronized retry storms.Intermediate · 36 min readLockedLocked

62Week 3 Project: Log Analyzer & API Health CheckerCombine files, regex, async HTTP, timeouts, errors and structured output into a practical Node project.Intermediate · 36 min readLockedLocked

63Designing Command-Line Interfaces without Framework MagicDesign predictable CLI contracts using arguments, usage text, exit codes and composable functions.Intermediate · 40 min readLockedLocked

64Prototypes & the JavaScript Object ModelUnderstand property lookup and prototype delegation beneath class syntax.Intermediate · 40 min readLockedLocked

65Classes, Private Fields & EncapsulationUse class syntax when object identity and behavior belong together, without forcing OOP everywhere.Intermediate · 40 min readLockedLocked

66`this`, `bind`, `call` & `apply`Reason about dynamic receiver binding and avoid losing method context.Intermediate · 40 min readLockedLocked

67Composition over Inheritance for Application DesignBuild behavior from small collaborators instead of deep class hierarchies.Intermediate · 40 min readLockedLocked

68Higher-Order Functions, Closures & Functional Building BlocksBuild reusable behavior by passing and returning functions.Intermediate · 40 min readLockedLocked

69Pure Functions, Side Effects & Immutable UpdatesSeparate calculation from I/O so code is easier to test and reason about.Intermediate · 40 min readLockedLocked

70Iterables, Iterators & GeneratorsUnderstand JavaScript iteration protocols and create lazy sequences.Intermediate · 40 min readLockedLocked

71Regular Expressions for Logs, Validation & ExtractionUse regular expressions for bounded text parsing without turning them into unreadable business logic.Intermediate · 40 min readLockedLocked

72Date, Time Zones, `Intl` & Temporal AwarenessHandle timestamps as instants and format them for humans without assuming local time equals UTC.Intermediate · 40 min readLockedLocked

73Symbols, `globalThis` & Protocol HooksRecognize Symbols and globalThis, and understand well-known Symbol hooks without overusing metaprogramming.Intermediate · 40 min readLockedLocked

74Modern ECMAScript: ES2015+ Feature Map & Compatibility ThinkingPlace ES6/ES7 in history and use stable modern syntax without assuming every runtime supports every new feature.Intermediate · 40 min readLockedLocked

75Dynamic `import()`, Top-Level `await` & Import AttributesLoad modules conditionally and understand modern ESM execution behavior.Intermediate · 40 min readLockedLocked

76Environment Configuration, Secrets & Secure DefaultsLoad configuration from environment values, validate it once and never leak secrets into logs/source.Intermediate · 40 min readLockedLocked

77Modern Runtime Features & Feature DetectionUse newer standardized capabilities only after checking the runtime contract and providing safe fallback behavior.Intermediate · 40 min readLockedLocked

78JavaScript Security Fundamentals for EngineersRecognize injection, secret, dependency and untrusted-input risks in browser and Node code.Intermediate · 40 min readLockedLocked

79Testing with Node’s Built-In `node:test`Write fast deterministic unit tests without requiring a third-party framework.Intermediate · 40 min readLockedLocked

80Async Testing, Dependency Injection & Mocks/FakesTest async code by controlling dependencies rather than making tests depend on real networks/time.Intermediate · 40 min readLockedLocked

81ESLint, Prettier, JSDoc & Automated Quality ChecksAutomate correctness/style feedback and document public interfaces without arguing about formatting manually.Intermediate · 40 min readLockedLocked

82Robust JavaScript Engineering: Validate, Bound, Retry, Clean UpCombine validation, deadlines, bounded concurrency, error context, cleanup and tests into production-minded code.Intermediate · 40 min readLockedLocked

83Week 4 Capstone: DevOps Automation ToolkitIntegrate the month into a modular Node CLI with health, URL checking, log analysis, tests and stable output contracts.Intermediate · 40 min readLockedLocked

84Capstone Productionization: Validation, Tests, CI & Failure DrillsProve the capstone under malformed input, network failure, timeouts and bad log data before calling it complete.Intermediate · 40 min readLockedLocked

85JavaScript Debugging & Troubleshooting PlaybookApply one cross-runtime troubleshooting workflow from syntax errors through async/network failures.Intermediate · 40 min readLockedLocked

86JavaScript Tooling Cheatsheet & 30-Day Graduation ChecklistConsolidate the language/runtime/tooling commands and prove you can independently build, debug and explain a modern JavaScript project.Intermediate · 40 min readLockedLocked