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25 SECTIONS · 702 TOPICS

Javascript Roadmap

  1. JavaScript Syntax and Fundamentals

    1. 1. JavaScript Syntax Structure and Statements
    2. Example: Statement types in action
    3. 2. Variable Declarations (var, let, const)
    4. Example: Variable declaration differences
    5. 3. Identifier Rules and Naming Conventions
    6. Example: Naming conventions in practice
    7. 4. Comments and Documentation Syntax
    8. Example: JSDoc documentation
    9. 5. Strict Mode ("use strict") and Effects
    10. Example: Strict mode effects
    11. 6. JavaScript Reserved Words and Keywords
    12. Cannot Use as Identifiers:
    13. Workarounds:
    14. Section 1 Summary

  2. JavaScript Data Types and Type System

    1. 1. Primitive Types (string, number, boolean, null, undefined, symbol, bigint)
    2. Example: Primitive type characteristics
    3. 2. Reference Types (object, array, function)
    4. Example: Primitive vs Reference behavior
    5. 3. Type Conversion and Coercion Rules
    6. Example: Type coercion in action
    7. 4. Type Checking (typeof, instanceof, Array.isArray)
    8. Example: Type checking techniques
    9. 5. Symbol Type and Well-known Symbols
    10. Example: Symbol usage and well-known symbols
    11. 6. BigInt for Large Integer Operations
    12. Example: BigInt operations and limitations
    13. Section 2 Summary

  3. JavaScript Variables, Scope, and Closure

    1. 1. Variable Hoisting and Temporal Dead Zone (TDZ)
    2. Example: Hoisting and TDZ behavior
    3. 2. Scope Types (Global, Function, Block, Module)
    4. Example: Different scope types
    5. 3. Lexical Scope and Scope Chain
    6. Example: Lexical scope and scope chain
    7. 4. Variable Shadowing and Name Resolution
    8. Example: Variable shadowing scenarios
    9. 5. Closure Patterns and Memory Management
    10. Example: Common closure patterns
    11. 6. Module Scope and Variable Isolation
    12. Example: Module scope and isolation
    13. Module Benefits:
    14. Before Modules (Legacy):
    15. Section 3 Summary

  4. JavaScript Operators and Expressions

    1. 1. Arithmetic Operators (+, -, *, /, %, **) and Math Operations
    2. Example: Arithmetic operators and edge cases
    3. 2. Assignment Operators (=, +=, -=, *=, /=) and Compound Assignment
    4. Example: Assignment operators
    5. 3. Comparison Operators (==, ===, !=, !==) and Equality Rules
    6. Example: Equality and comparison operators
    7. 4. Logical Operators (&&, ||, !) and Short-circuit Evaluation
    8. Example: Logical operators and short-circuit evaluation
    9. 5. Bitwise Operators (&, |, ^, ~,
    10. Example: Bitwise operations
    11. 6. Optional Chaining (?.) and Nullish Coalescing (??) Operators
    12. Example: Optional chaining and nullish coalescing
    13. 7. Logical Assignment Operators (||=, &&=, ??=) - ES2021
    14. Before ES2021:
    15. With ES2021:
    16. Example: Logical assignment operators
    17. Section 4 Summary

  5. JavaScript Control Flow and Loops

    1. 1. Conditional Statements (if, else, switch, ternary)
    2. Example: Conditional statements
    3. 2. Loop Statements (for, while, do-while)
    4. Example: Classic loop statements
    5. 3. Enhanced Loops (for...in, for...of, for await...of)
    6. Example: Enhanced loops
    7. 4. Jump Statements (break, continue, return)
    8. Example: Jump statements
    9. 5. Exception Handling (try, catch, finally, throw)
    10. Example: Exception handling
    11. 6. Labels and Labeled Statements
    12. Example: Labeled statements
    13. Section 5 Summary

  6. JavaScript Functions and Functional Programming

    1. 1. Function Declaration vs Function Expression Syntax
    2. Example: Function declaration vs expression
    3. 2. Arrow Functions (=>) and Lexical this Binding
    4. Example: Lexical this binding in practice
    5. Example: Arrow function syntax variations
    6. 3. Function Parameters (default, rest, destructuring)
    7. Example: Default parameters
    8. Example: Rest parameters
    9. Example: Destructuring parameters
    10. 4. Higher-Order Functions and Callbacks
    11. Example: Higher-order functions
    12. Example: Array HOF methods in action
    13. 5. Closures and Function Scope Management
    14. Example: Basic closure mechanics
    15. Example: Practical closure patterns
    16. 6. IIFE Patterns (Immediately Invoked Function Expression) and Module Creation
    17. Example: IIFE basics and variations
    18. Example: Module pattern with IIFE
    19. 7. Function Methods (call, apply, bind)
    20. Example: call() and apply()
    21. Example: bind() for permanent binding
    22. 8. Recursion and Tail Call Optimization
    23. Example: Basic recursion patterns
    24. Example: Converting to tail recursion
    25. Example: When to use recursion vs iteration
    26. Section 6 Summary

  7. JavaScript Objects and Properties

    1. 1. Object Literal Syntax and Computed Properties
    2. Example: Modern object literal syntax
    3. Example: Computed properties in practice
    4. 2. Property Descriptors and Object.defineProperty()
    5. Example: Property descriptors in action
    6. Example: Accessor properties with get/set
    7. Example: Non-enumerable and non-configurable properties
    8. 3. Object Methods (Object.keys, Object.values, Object.entries)
    9. Example: Object.keys, values, entries
    10. Example: Enumerable vs non-enumerable properties
    11. Example: Practical use cases
    12. 4. Object Creation Patterns (Object.create, constructors)
    13. Example: Object.create() patterns
    14. Example: Constructor functions
    15. Example: Factory functions
    16. 5. Object Cloning and Merging (Object.assign, spread operator)
    17. Example: Shallow copying with Object.assign and spread
    18. Example: Deep cloning techniques
    19. Example: Object.assign vs spread differences
    20. 6. Property Getters and Setters
    21. Example: Getters and setters in object literals
    22. Example: Getters/setters in classes
    23. Example: Advanced getter/setter patterns
    24. 7. Object Freezing and Sealing (freeze, seal, preventExtensions)
    25. Example: Object.preventExtensions()
    26. Example: Object.seal()
    27. Example: Object.freeze()
    28. Example: Shallow vs deep freeze
    29. Example: Practical use cases
    30. Section 7 Summary

  8. JavaScript Prototypes and Inheritance

    1. 1. Prototype Chain and Property Lookup
    2. Example: Understanding the prototype chain
    3. Example: Property shadowing and prototype lookup
    4. Example: Working with prototypes
    5. 2. Constructor Functions and new Operator
    6. Example: Constructor functions and instances
    7. Example: Manual simulation of 'new' operator
    8. Example: Constructor patterns and best practices
    9. 3. Object.create() and Prototypal Inheritance
    10. Example: Object.create for prototypal inheritance
    11. Example: Object.create with property descriptors
    12. Example: Implementing classical inheritance with Object.create
    13. 4. Prototype Methods and Property Override
    14. Example: Method inheritance and override
    15. Example: Calling parent methods (super pattern)
    16. Example: Property shadowing and resolution
    17. Example: Mixin pattern for method sharing
    18. 5. instanceof Operator and Prototype Testing
    19. Example: instanceof operator
    20. Example: isPrototypeOf() method
    21. Example: Property ownership testing
    22. Example: Type checking best practices
    23. 6. Object Delegation Patterns
    24. Example: OLOO pattern (Objects Linked to Other Objects)
    25. Example: Concatenative inheritance (composition)
    26. Example: Functional inheritance with closures
    27. Example: Practical delegation patterns
    28. Section 8 Summary

  9. JavaScript Arrays and Array Methods

    1. 1. Array Creation and Initialization Patterns
    2. Example: Various array creation patterns
    3. 2. Array Mutating Methods (push, pop, shift, unshift, splice, sort, reverse)
    4. Example: Mutating array methods
    5. 3. Array Non-mutating Methods (slice, concat, join)
    6. Example: Non-mutating array methods
    7. 4. Array Iteration Methods (forEach, map, filter, reduce, reduceRight)
    8. Example: Array iteration methods
    9. 5. Array Search Methods (find, findIndex, includes, indexOf, lastIndexOf)
    10. Example: Array search methods
    11. 6. Array Testing Methods (every, some)
    12. Example: Array testing methods
    13. 7. Array Destructuring and Spread Operator [...]
    14. Example: Destructuring and spread patterns
    15. 8. Typed Arrays and Buffer Management
    16. Example: Typed arrays and buffer operations
    17. Section 9 Summary

  10. JavaScript Strings and Template Literals

    1. 1. String Creation and String Literals
    2. Example: String creation patterns
    3. 2. String Methods (slice, substring, charAt, indexOf, replace, split)
    4. Example: String manipulation methods
    5. 3. Template Literals (``) and Tag Functions
    6. Example: Template literals and tag functions
    7. 4. String Interpolation (${}) and Expression Embedding
    8. Example: String interpolation patterns
    9. 5. Unicode Handling and Character Encoding
    10. Example: Unicode handling
    11. 6. String Regular Expression Integration
    12. Example: String RegExp integration
    13. Section 10 Summary

  11. JavaScript Regular Expressions (RegEx)

    1. 1. RegExp Literal (/pattern/) and Constructor Syntax
    2. Example: RegExp creation and properties
    3. 2. RegExp Flags (g, i, m, s, u, y) and Global Modifiers
    4. Example: Flag behaviors
    5. 3. Pattern Matching Methods (test, exec, match, matchAll)
    6. Example: Pattern matching methods
    7. 4. String RegExp Methods (replace, replaceAll, split, search)
    8. Example: String RegExp methods
    9. 1. RegExp Literal (/pattern/) and Constructor Syntax
    10. Example: RegExp creation and properties
    11. 2. RegExp Flags (g, i, m, s, u, y) and Global Modifiers
    12. Example: Flag behaviors
    13. 3. Pattern Matching Methods (test, exec, match, matchAll)
    14. Example: Pattern matching methods
    15. 4. String RegExp Methods (replace, replaceAll, split, search)
    16. Example: String RegExp methods
    17. 5. Character Classes ([abc], \d, \w, \s) and Quantifiers (+, *, ?, {n})
    18. Example: Character classes and quantifiers
    19. 6. Lookahead (?=) and Lookbehind (?
    20. Example: Lookahead and lookbehind
    21. 7. Named Capture Groups (?
    22. Example: Named groups and backreferences
    23. Section 11 Summary

  12. JavaScript Numbers, Math, and BigInt

    1. 1. Number Types and Numeric Literals
    2. Example: Numeric literal forms
    3. 2. Number Methods (toFixed, toPrecision, toString, isNaN, isFinite)
    4. Example: Number methods and constants
    5. 3. Math Object Methods (Math.round, Math.floor, Math.ceil, Math.random)
    6. Example: Math operations
    7. 4. Number Precision and Floating Point Issues
    8. Example: Floating point precision handling
    9. 5. BigInt Creation and Arithmetic Operations
    10. Example: BigInt usage
    11. 6. Number Parsing (parseInt, parseFloat, Number())
    12. Example: Parsing and validation
    13. Section 12 Summary

  13. JavaScript Date and Time

    1. 1. Date Object Creation and Methods
    2. Example: Date creation and methods
    3. 2. Date Formatting and Parsing
    4. Example: Date formatting and parsing
    5. 3. Timezone Handling and UTC Operations
    6. Example: Timezone handling
    7. 4. Date Arithmetic and Calculations
    8. Example: Date arithmetic
    9. 5. Intl.DateTimeFormat and Internationalization
    10. Example: Intl.DateTimeFormat usage
    11. Section 13 Summary

  14. JavaScript Async Programming (Promises and async/await)

    1. 1. Callback Patterns and Error Handling
    2. Example: Callback patterns
    3. 2. Promise API (new Promise, then, catch, finally) and Promise Chaining
    4. Example: Promise creation and chaining
    5. 3. async/await Syntax and Error Handling
    6. Example: async/await usage
    7. 4. Promise Combinators (Promise.all, Promise.race, Promise.allSettled, Promise.any)
    8. Example: Promise combinators
    9. 5. Event Loop and Task Queue Management
    10. Example: Event loop execution order
    11. 6. Microtasks vs Macrotasks Execution Order
    12. Example: Microtask vs macrotask behavior
    13. 7. Timer Functions (setTimeout, setInterval, requestAnimationFrame)
    14. Example: Timer functions
    15. Section 14 Summary

  15. ES6+ Features and Modern JavaScript Syntax

    1. 1. Destructuring Assignment (array, object, nested)
    2. Example: Destructuring patterns
    3. 2. Spread (...) and Rest Syntax Applications
    4. Example: Spread and rest usage
    5. 3. Default Parameters and Parameter Destructuring
    6. Example: Default parameters
    7. 4. Enhanced Object Literals and Method Shorthand
    8. Example: Enhanced object literals
    9. 5. Template Literals and Tagged Templates
    10. Example: Template literals
    11. 6. Symbol Type and Symbol Registry (Symbol.for)
    12. Well-Known Symbols
    13. Example: Symbols
    14. 7. WeakMap and WeakSet Collections
    15. WeakMap Methods
    16. WeakSet Methods
    17. Example: WeakMap and WeakSet
    18. Section 15 Summary:

  16. ES2015+ Advanced JavaScript Features

    1. 1. Map and Set Collections and Methods
    2. Map vs Object
    3. Map Methods
    4. Set vs Array
    5. Set Methods
    6. Example: Map with different key types
    7. Example: Set operations and uniqueness
    8. Example: Practical Map use cases
    9. 2. Proxy and Reflect API for Metaprogramming
    10. Proxy Traps (Handler Methods)
    11. Reflect API Methods
    12. Example: Basic Proxy with get and set traps
    13. Example: Default values and negative indexing
    14. Example: Function call interception
    15. Example: Observable/reactive object
    16. 3. Generator Functions (function*) and Iterator Protocol
    17. Generator Function Syntax
    18. Generator Methods
    19. yield Expressions
    20. Example: Basic generator function
    21. Example: Two-way communication with generators
    22. Example: yield* delegation
    23. Example: Generator control flow
    24. 4. JavaScript Modules (import/export, dynamic imports)
    25. Export Syntax
    26. Import Syntax
    27. Module Features
    28. Example: Named exports and imports
    29. Example: Default exports
    30. Example: Re-exports and barrel exports
    31. Example: Dynamic imports
    32. 5. Private Fields (#) and Class Features
    33. Private Field Syntax
    34. Class Field Features
    35. Example: Private fields and methods
    36. Example: Private getters and setters
    37. Example: Static private fields and methods
    38. Example: Static initialization blocks
    39. 6. Optional Chaining (?.) and Nullish Coalescing (??)
    40. Optional Chaining Operators
    41. Nullish Coalescing vs OR
    42. Comparison Table
    43. Example: Optional chaining basics
    44. Example: Optional chaining with function calls
    45. Example: Nullish coalescing operator
    46. Example: Combined optional chaining and nullish coalescing
    47. 7. Logical Assignment (||=, &&=, ??=) and Numeric Separators (_)
    48. Logical Assignment Operators
    49. Behavior Comparison
    50. Numeric Separators
    51. Example: Logical OR assignment (||=)
    52. Example: Logical AND assignment (&&=)
    53. Example: Nullish assignment (??=)
    54. Example: Numeric separators
    55. Section 16 Summary

  17. JavaScript Classes and OOP (Object-Oriented Programming)

    1. 1. Class Declaration and Constructor Methods
    2. Class Declaration Syntax
    3. Constructor Features
    4. Example: Basic class declaration
    5. Example: Constructor with field declarations
    6. Example: Constructor patterns and validation
    7. Example: Constructor return behavior
    8. 2. Instance Methods and Static Methods
    9. Method Types Comparison
    10. Method Features
    11. Example: Instance methods
    12. Example: Static methods
    13. Example: Mixing instance and static methods
    14. Example: Static method inheritance
    15. 3. Class Inheritance (extends) and super Keyword
    16. Inheritance Syntax
    17. super Rules
    18. Example: Basic inheritance
    19. Example: super in methods
    20. Example: Multi-level inheritance
    21. Example: Static method inheritance
    22. 4. Private Fields (#field) and Private Methods (#method)
    23. Private Member Types
    24. Private vs Public Comparison
    25. Example: Private fields and methods
    26. Example: Private static members
    27. Example: Private fields with inheritance
    28. Example: Practical private member use case
    29. 5. Getters (get) and Setters (set) in Classes
    30. Accessor Types
    31. Getter/Setter Features
    32. Example: Basic getters and setters
    33. Example: Validation with setters
    34. Example: Lazy evaluation and caching
    35. Example: Static getters and setters
    36. Example: Private getters and setters
    37. 6. Class Expressions and Anonymous Classes
    38. Class Expression Types
    39. Class Expression vs Declaration
    40. Example: Class expressions
    41. Example: Conditional class creation
    42. Example: Inline and IIFE classes
    43. Example: Mixin pattern with class expressions
    44. 7. Mixin Patterns and Class Composition
    45. Mixin Approaches
    46. Composition Patterns
    47. Example: Subclass factory mixins
    48. Example: Object.assign mixin pattern
    49. Example: Functional composition pattern
    50. Example: Advanced mixin composition
    51. Example: Trait-based composition
    52. Section 17 Summary

  18. JavaScript Iterators, Generators, and Iteration

    1. 1. Iterator Interface (Symbol.iterator) and Iterable Protocol
    2. Iterator Protocol
    3. Iterable Protocol
    4. Built-in Iterables
    5. Consuming Iterables
    6. Example: Understanding iterator protocol
    7. Example: Creating simple iterator
    8. Example: Creating iterable object
    9. Example: Iterable with state
    10. 2. Generator Functions (function*) and yield Expressions
    11. Generator Function Syntax
    12. yield Expression Types
    13. Generator Object Properties
    14. Example: Basic generator functions
    15. Example: yield expressions and two-way communication
    16. Example: yield* delegation
    17. Example: Infinite sequences and lazy evaluation
    18. 3. Generator Methods (next, return, throw) and Return Values
    19. Generator Methods
    20. Generator Return Behavior
    21. finally Block Behavior
    22. Example: Generator return() method
    23. Example: Generator throw() method
    24. Example: Cleanup with finally
    25. Example: Return values and yield*
    26. 4. Async Generators (async function*) and for-await-of Loops
    27. Async Generator Syntax
    28. AsyncGenerator Methods
    29. for-await-of Loop
    30. Async Iterable Protocol
    31. Example: Basic async generators
    32. Example: Async generator methods
    33. Example: Streaming data processing
    34. Example: Combining async generators
    35. 5. Custom Iterator Implementation
    36. Iterator Implementation Checklist
    37. Iterator Pattern Variations
    38. Example: Custom collection iterators
    39. Example: Iterators with cleanup
    40. Example: Advanced iterator patterns
    41. 6. Iterator Helper Methods (take, drop, filter) - ES2024
    42. Iterator Helper Methods (ES2024+)
    43. Lazy vs Eager Evaluation
    44. Example: Polyfill implementations (pre-ES2024)
    45. Example: Terminal operations
    46. Example: Practical use cases
    47. Example: Composing iterator helpers
    48. Section 18 Summary: Iterators, Generators, and Iteration Protocols

  19. JavaScript Error Handling and Debugging

    1. 1. Error Types (Error, TypeError, ReferenceError, SyntaxError) and Properties
    2. Built-in Error Types
    3. Error Object Properties
    4. Error Constructor Options
    5. Example: Built-in error types
    6. Example: Error object properties
    7. Example: Parsing stack traces
    8. 2. Custom Error Classes and Error Inheritance
    9. Custom Error Pattern
    10. Common Custom Error Types
    11. Example: Basic custom error class
    12. Example: Domain-specific error classes
    13. Example: Advanced error patterns
    14. 3. Exception Propagation and Error Boundaries
    15. Exception Propagation Rules
    16. Error Boundary Patterns
    17. Error Recovery Strategies
    18. Example: Exception propagation patterns
    19. Example: Global error handlers
    20. Example: Error recovery strategies
    21. 4. Console API (console.log, console.error, console.table, console.trace)
    22. Console Logging Methods
    23. Console Formatting and Inspection
    24. Console Utilities
    25. String Substitution Patterns
    26. Example: Basic console methods
    27. Example: Console grouping and organization
    28. Example: Console utilities
    29. Example: Custom logger implementation
    30. 5. Debugging Techniques and Breakpoint Usage
    31. Breakpoint Types
    32. Debugger Commands
    33. Debug Console Commands
    34. Debugging Best Practices
    35. Example: Debugger statement and breakpoints
    36. Example: Debugging async code
    37. Example: Advanced debugging techniques
    38. 6. Error Monitoring and Production Debugging
    39. Error Monitoring Services
    40. Error Context Data
    41. Production Debugging Strategies
    42. Example: Error monitoring setup
    43. Example: Production logging system
    44. Example: Error sampling and rate limiting
    45. Example: Release tracking and version management
    46. Section 19 Summary: Error Handling and Debugging Techniques

  20. JavaScript Memory Management and Performance

    1. 1. Garbage Collection and Memory Lifecycle
    2. JavaScript Memory Lifecycle
    3. Garbage Collection Algorithms
    4. V8 Heap Structure
    5. Reachability and GC Roots
    6. Example: Understanding garbage collection
    7. Example: Monitoring memory usage
    8. 2. Memory Leak Prevention and Detection
    9. Common Memory Leak Patterns
    10. Detection Tools and Techniques
    11. Prevention Best Practices
    12. Example: Common memory leak patterns
    13. Example: Memory leak detection
    14. Example: Proper cleanup patterns
    15. 3. Performance Optimization Strategies
    16. Rendering Performance
    17. JavaScript Performance
    18. Network Performance
    19. Example: Avoiding layout thrashing
    20. Example: Debounce and throttle
    21. Example: Memoization and caching
    22. 4. Profiling and Performance Monitoring
    23. Performance API Methods
    24. Performance Entry Types
    25. Core Web Vitals
    26. Chrome DevTools Profiling
    27. Example: Performance measurement
    28. Example: Performance monitoring class
    29. Example: Core Web Vitals measurement
    30. 5. Code Splitting and Lazy Loading
    31. Code Splitting Strategies
    32. Dynamic Import Syntax
    33. Lazy Loading Techniques
    34. Bundle Optimization
    35. Example: Dynamic imports
    36. Example: Intersection Observer for lazy loading
    37. Example: Module loading strategies
    38. 6. V8 Engine Optimization Techniques
    39. V8 Optimization Concepts
    40. Optimization-Friendly Patterns
    41. Common Deoptimization Triggers
    42. Example: Hidden classes and object shape
    43. Example: Array optimization
    44. Example: Function optimization
    45. Section 20 Summary: Memory Management and Performance

  21. JavaScript Web APIs and Browser

    1. 1. Fetch API and HTTP Request Handling
    2. Fetch API Basics
    3. Response Properties
    4. Request Options
    5. HTTP Status Code Categories
    6. Example: Basic fetch requests
    7. Example: Advanced fetch patterns
    8. 2. DOM Manipulation (querySelector, getElementById, createElement)
    9. Element Selection Methods
    10. Element Creation and Modification
    11. Modern DOM Insertion Methods
    12. Element Properties and Attributes
    13. CSS Class Manipulation
    14. Example: DOM selection and manipulation
    15. Example: Efficient DOM manipulation
    16. 3. Event System (addEventListener) and Event Delegation
    17. Event Registration Methods
    18. Event Listener Options
    19. Common Event Types
    20. Event Object Properties
    21. Event Control Methods
    22. Example: Event handling basics
    23. Example: Event delegation
    24. 4. Storage APIs (localStorage, sessionStorage, IndexedDB)
    25. Web Storage API (localStorage & sessionStorage)
    26. localStorage vs sessionStorage
    27. IndexedDB Key Concepts
    28. IndexedDB Transaction Modes
    29. Example: localStorage and sessionStorage
    30. Example: IndexedDB basic operations
    31. 5. Clipboard API and File API
    32. Clipboard API Methods
    33. File Input Properties
    34. File Object Properties
    35. FileReader Methods
    36. Drag and Drop Events
    37. Example: Clipboard API
    38. Example: File API - reading files
    39. Example: Drag and drop file upload
    40. 6. Geolocation API and Device APIs
    41. Geolocation API Methods
    42. Position Object Properties
    43. Geolocation Options
    44. Device Orientation Properties
    45. Other Device APIs
    46. Example: Geolocation API
    47. Example: Device orientation and other APIs
    48. 7. Web Workers and Service Workers
    49. Web Worker Types
    50. Worker Methods and Events
    51. Service Worker Lifecycle
    52. Service Worker Events
    53. Cache Strategies
    54. Example: Web Workers
    55. Example: Service Workers
    56. Section 21 Summary: Web APIs and Browser Integration

  22. JavaScript Design Patterns

    1. 1. Module Patterns and Namespace Management
    2. Module Pattern Types
    3. ES6 Module Syntax
    4. Module Benefits
    5. Example: Module patterns
    6. 2. Observer Pattern and Event Emitters
    7. Observer Pattern Components
    8. Event Emitter Methods
    9. Observer Pattern Benefits
    10. Example: Observer pattern and Event Emitter
    11. 3. Factory Pattern and Builder Pattern
    12. Factory Pattern Types
    13. Builder Pattern Benefits
    14. Factory vs Constructor
    15. Example: Factory patterns
    16. Example: Builder pattern
    17. 4. Singleton Pattern and Registry Pattern
    18. Singleton Characteristics
    19. Registry Pattern Uses
    20. Singleton vs Global Variable
    21. Example: Singleton pattern
    22. Example: Registry pattern
    23. 5. Strategy Pattern and Command Pattern
    24. Strategy Pattern Components
    25. Command Pattern Elements
    26. Pattern Benefits
    27. Example: Strategy pattern
    28. Example: Command pattern
    29. 6. Decorator Pattern and Proxy Pattern
    30. Decorator Pattern Features
    31. Proxy Pattern Types
    32. ES6 Proxy Traps
    33. Example: Decorator pattern
    34. Example: Proxy pattern
    35. Section 22 Summary: Modern JavaScript Patterns and Techniques

  23. JavaScript Functional Programming

    1. 1. Pure Functions and Side Effects Management
    2. Pure Function Characteristics
    3. Common Side Effects
    4. Managing Side Effects
    5. Example: Pure functions vs impure
    6. 2. Higher-Order Functions and Function Composition
    7. Higher-Order Function Types
    8. Common Higher-Order Functions
    9. Function Composition Patterns
    10. Example: Higher-order functions
    11. Example: Function composition
    12. 3. Currying and Partial Application
    13. Currying vs Partial Application
    14. Currying Benefits
    15. Partial Application Techniques
    16. Example: Currying
    17. Example: Partial application
    18. 4. Immutability and Functional Data Structures
    19. Immutability Principles
    20. Immutable Operations
    21. Immutability Benefits
    22. Example: Immutable operations
    23. Example: Functional data structures
    24. 5. Monads and Functional Error Handling
    25. Monad Characteristics
    26. Common Monads
    27. Functional Error Handling Patterns
    28. Example: Maybe monad
    29. Example: Either monad and Result pattern
    30. 6. Function Pipelines and Data Transformation
    31. Pipeline Patterns
    32. Data Transformation Operations
    33. Pipeline Benefits
    34. Example: Pipeline operators and data transformation
    35. Section 23 Summary: Functional Programming Concepts

  24. JavaScript Testing and Code Quality

    1. 1. Unit Testing Strategies and Test Structure
    2. Unit Test Principles
    3. Test Structure (AAA Pattern)
    4. Test Naming Conventions
    5. Test Organization
    6. Example: Unit test structure
    7. 2. Mocking and Stubbing Techniques
    8. Test Doubles Types
    9. Jest Mock Methods
    10. Mock Assertions
    11. Example: Mocking and stubbing
    12. 3. Test-Driven Development (TDD) Patterns
    13. TDD Cycle (Red-Green-Refactor)
    14. TDD Benefits
    15. TDD Best Practices
    16. Example: TDD workflow
    17. 4. Code Coverage and Quality Metrics
    18. Coverage Types
    19. Quality Metrics
    20. Coverage Tools
    21. Example: Code coverage
    22. 5. Assertion Libraries (expect, assert) and Testing Utilities
    23. Common Assertion Libraries
    24. Jest Matchers
    25. Testing Utilities
    26. Example: Assertions and matchers
    27. 6. Integration and End-to-End (E2E) Testing
    28. Testing Pyramid
    29. Integration Test Types
    30. E2E Testing Tools
    31. Example: Integration testing
    32. Example: E2E testing with Playwright
    33. Section 24 Summary: Testing and Code Quality

  25. JavaScript Security and Best Practices

    1. 1. Input Validation and Sanitization
    2. Common Input Threats
    3. Validation Strategies
    4. Sanitization Techniques
    5. Example: Input validation and sanitization
    6. 2. XSS Prevention and Content Security Policy (CSP)
    7. XSS Attack Types
    8. XSS Prevention Techniques
    9. CSP Directives
    10. Example: XSS prevention
    11. 3. Secure Coding Practices and Code Review
    12. OWASP Top 10 Web Vulnerabilities
    13. Secure Coding Principles
    14. Code Review Security Checklist
    15. Example: Secure coding practices
    16. 4. Data Encryption and Hashing
    17. Encryption vs Hashing
    18. Encryption Algorithms
    19. Hashing Algorithms
    20. Example: Encryption and hashing
    21. 5. Authentication and Authorization Patterns
    22. Authentication Methods
    23. Authorization Models
    24. JWT Structure
    25. Example: Authentication and authorization
    26. 6. Security Headers and HTTPS Integration
    27. Essential Security Headers
    28. CORS Headers
    29. HTTPS Best Practices
    30. Example: Security headers and HTTPS
    31. Section 25 Summary: Security and Best Practices