JavaScript

JavaScript

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Last Update	09/13/2026
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Section 2: Core Syntax and Types

10Lessons ·
- 9: Type Coercion Rules
  
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- 10: Strict Equality vs Loose Equality
  
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- 15: typeof and instanceof
  
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Section 3: Strings and Numbers in Depth

6Lessons ·
- 17: String Methods: slice, substring, split
  
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- 18: String Methods: includes, startsWith, endsWith
  
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- 19: String Methods: padStart, padEnd, trim
  
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Section 5: Functions

11Lessons ·
- 30: Default and Rest Parameters
  
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- 37: Function Currying
  
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Section 6: Objects and Arrays

12Lessons ·
- 41: Destructuring Objects and Arrays
  
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- 43: Array Methods: map, filter, reduce
  
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- 45: Array Methods: flat and flatMap
  
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Section 12: Modern JavaScript (ES2015-ES2025)

10Lessons ·
- 99: Let, Const, and Block Scoping Revisited
  
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- 100: Optional Chaining and Nullish Coalescing
  
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- 105: Array and Object New Methods by Version
  
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Section 14: Error Handling and Debugging

6Lessons ·
- 116: The Error Object and Stack Traces
  
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- 118: Common JavaScript Pitfalls and Gotchas
  
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Section 18: Performance

7Lessons ·
- 136: Debouncing and Throttling
  
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- 139: Optimizing Loops and Large Data Processing
  
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Section 20: Regular Expressions

6Lessons ·
- 153: Using Regex with String Methods
  
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Section 36: More Global Functions (MDN Reference)

5Lessons ·
- 247: parseInt and parseFloat Edge Cases
  
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