JavaScript Fundamentals

Master the core concepts that power every JavaScript application. These guides cover the essential building blocks you need to become a confident JavaScript developer.

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Variables & Data Types

• Variables - The building blocks of every program
• Strings - Working with text data
• Numbers - Mathematical operations and number handling
• Dates - Date and time manipulation

Data Structures

• Arrays - Ordered collections of data
• Objects - Key-value data structures

Control Flow

• Conditionals - Making decisions in code
• Loops - Repeating operations

Functions & Scope

• Functions - Reusable blocks of code
• Scope - Variable visibility and access
• Hoisting - How JavaScript processes declarations
• Closures - Functions that remember their environment
• The this Keyword - Context and binding

Modern JavaScript (ES6+)

• Destructuring - Extract values from arrays and objects
• Spread & Rest Operators - Expanding and collecting values
• Modules - Organizing code into reusable pieces

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Learning Path

Recommended order for beginners:

1. Start with Variables
2. Learn Strings and Numbers
3. Master Arrays and Objects
4. Understand Functions and Scope
5. Practice with Conditionals and Loops
6. Level up with ES6+ features

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Next Steps

Once you've mastered the fundamentals, continue your journey:

• Async JavaScript - Promises, async/await, and the event loop
• Object-Oriented JavaScript - Classes, prototypes, and inheritance
• DOM Manipulation - Interacting with web pages