javascript

1.Variables
2.Data Types
3.Operators
4.Control Flow
5.Functions
6.Loops
7.Arrays
8.Objects
9.Events
10.DOM Manipulation
11.Error Handling
12.Closures
13.Scope
14.Hoisting
15.Prototypes
16.Callbacks
17.Promises
18.Async/Await
19.Modules
20.Event Loop
21.Timers (setTimeout, setInterval)
22.Map and Set
23.WeakMap and WeakSet
24.Symbol
25.Destructuring
26.Spread and Rest Operators
27.Template Literals
28.Default Parameters
29.Arrow Functions
30.Classes
31.Inheritance
32.Static Methods
33.Getters and Setters
34.Instance vs Static Properties
35.JSON Handling
36.Regular Expressions
37.Error Objects
38.Custom Errors
39.Strict Mode
40.Memory Management
41.Garbage Collection
42.Module Bundlers (e.g., Webpack, Rollup)
43.Tree Shaking
44.Dynamic Import
45.Shallow vs Deep Copy
46.Debouncing and Throttling
47.Service Workers
48.Web APIs
49.Canvas API
50.Fetch API
51.WebSockets
52.Storage APIs (localStorage, sessionStorage, IndexedDB)
53.Performance Optimization
54.Code Splitting
55.Polyfills
56.Transpilers (e.g., Babel)
57.Testing (Unit, Integration, End-to-End)
58.Linting and Formatting
59.TypeScript Basics
60.Functional Programming
61.Immutable Data Structures
62.Reactive Programming
63.State Management Libraries (e.g., Redux, MobX)
64.Server-Side Rendering (SSR)
65.Client-Side Rendering (CSR)
66.Static Site Generation (SSG)
67.Progressive Web Apps (PWAs)
68.Advanced Event Handling
69.Custom Hooks (React)
70.React Context API
71.Higher-Order Components
72.Render Props
73.JS Performance Profiling
74.WebAssembly
75.Internationalization (i18n)
76.Security Best Practices (e.g., XSS, CSRF)
77.Design Patterns in JavaScript
78.SOLID Principles in JavaScript
79.Data Structures and Algorithms
80.Big O Notation
81.Custom Data Structures

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51. WebSockets