Your browser does not support JavaScript.

1. Introduction to Functions
- 1.1 What is a Function?
- 1.2 Benefits of Using Functions
- 1.3 Basic Function Syntax
- 1.4 Executing Functions
2. Function Declarations and Expressions
- 2.1 Function Declarations
- 2.2 Function Expressions
- 2.3 Named vs. Anonymous Functions
- 2.4 Immediately Invoked Function Expressions (IIFEs)
3. Parameters and Arguments
- 3.1 Defining Parameters
- 3.2 Passing Arguments
- 3.3 Default Parameters
- 3.4 Rest Parameters
- 3.5 The `arguments` Object
- 3.6 Spread Syntax in Function Calls
4. Return Values
- 4.1 Using the `return` Statement
- 4.2 Returning vs. Not Returning
- 4.3 Multiple Return Statements
- 4.4 Returning Objects and Arrays
- 4.5 Function Side Effects
5. Understanding Scope
- 5.1 What is Scope?
- 5.2 Global Scope
- 5.3 Function Scope
- 5.4 Block Scope with `let` and `const`
- 5.5 Scope Chain
6. Hoisting
- 6.1 Variable Hoisting
- 6.2 Function Hoisting
- 6.3 Hoisting with `let` and `const`
- 6.4 Avoiding Hoisting Pitfalls
7. Closures
- 7.1 Introduction to Closures
- 7.2 Creating Closures
- 7.3 Practical Uses of Closures
- 7.4 Memory Considerations
- 7.5 Avoiding Common Mistakes with Closures
8. Arrow Functions
- 8.1 Syntax of Arrow Functions
- 8.2 Arrow Functions vs. Traditional Functions
- 8.3 `this` Binding in Arrow Functions
- 8.4 Implicit Return
- 8.5 When Not to Use Arrow Functions
9. Higher-Order Functions
- 9.1 What are Higher-Order Functions?
- 9.2 Passing Functions as Arguments
- 9.3 Returning Functions from Functions
- 9.4 Built-in Higher-Order Functions
- 9.5 Practical Examples
10. Recursion in Functions
- 10.1 What is Recursion?
- 10.2 Base Case and Recursive Case
- 10.3 Practical Recursive Functions
- 10.4 Tail Recursion
- 10.5 Recursion vs. Iteration
11. The `this` Keyword in Functions
- 11.1 Understanding Context
- 11.2 `this` in Global and Function Scope
- 11.3 Changing `this` with `call`, `apply`, and `bind`
- 11.4 `this` in Arrow Functions
- 11.5 Common Pitfalls with `this`
12. Function Methods: `call`, `apply`, and `bind`
- 12.1 The `call` Method
- 12.2 The `apply` Method
- 12.3 The `bind` Method
- 12.4 Practical Applications
13. Object Methods and `this`
- 13.1 Defining Methods in Objects
- 13.2 Method Invocation and `this`
- 13.3 Issues with Method Context
- 13.4 Solutions to Context Loss
14. Functions are First-Class Citizens
- 14.1 Functions as Values
- 14.2 Storing Functions in Data Structures
- 14.3 Functions Returning Functions
- 14.4 Callback Functions
- 14.5 Practical Examples
15. Constructors and the `new` Keyword
- 15.1 Function Constructors
- 15.2 The `new` Operator
- 15.3 Adding Properties and Methods
- 15.4 Prototypal Inheritance with Constructors
- 15.5 ES6 Classes as Syntactic Sugar
16. Prototypes and Inheritance
- 16.1 The Prototype Chain
- 16.2 Accessing and Modifying Prototypes
- 16.3 Inheriting Properties and Methods
- 16.4 `Object.create` Method
- 16.5 ES6 Class Inheritance
17. Generators and Iterators
- 17.1 Introduction to Generators
- 17.2 Syntax of Generators
- 17.3 Creating Custom Iterators
- 17.4 Asynchronous Generators
- 17.5 Practical Use Cases
18. Asynchronous Functions
- 18.1 Callbacks Revisited
- 18.2 Promises
- 18.3 The `async` and `await` Keywords
- 18.4 Error Handling in Async Functions
- 18.5 Combining Promises and Async/Await
19. Error Handling in Functions
- 19.1 The `try...catch` Statement
- 19.2 Throwing Errors
- 19.3 Error Propagation
- 19.4 Best Practices for Error Handling
- 19.5 Logging and Debugging
20. Advanced Function Patterns
- 20.1 Memoization
- 20.2 Currying
- 20.3 Function Composition
- 20.4 Partial Application
- 20.5 Throttling and Debouncing
21. Performance Optimization
- 21.1 Identifying Bottlenecks
- 21.2 Optimizing Recursive Functions
- 21.3 Scope and Closure Optimization
- 21.4 Minimizing Memory Usage
- 21.5 Best Practices for Efficient Code
22. Testing and Debugging Functions
- 22.1 Importance of Testing
- 22.2 Unit Testing with Frameworks
- 22.3 Writing Effective Test Cases
- 22.4 Debugging Techniques
- 22.5 Test-Driven Development
23. Best Practices in Function Design
- 23.1 Clean Code Principles
- 23.2 Reusability and Modularity
- 23.3 Avoiding Side Effects
- 23.4 Documentation and Comments
- 23.5 Code Reviews and Refactoring
24. Practical Applications
- 24.1 Functions in DOM Manipulation
- 24.2 Event Handling Functions
- 24.3 Data Processing with Functions
- 24.4 API Interaction Functions
- 24.5 Building a Functional Utility Library
25. Functional Programming Concepts
- 25.1 Immutability
- 25.2 Pure Functions
- 25.3 Function Composition in Depth
- 25.4 Lazy Evaluation
- 25.5 Functional Programming Libraries
26. Modules and Scope
- 26.1 Introduction to Modules
- 26.2 Exporting and Importing Functions
- 26.3 Module Scope
- 26.4 Named vs. Default Exports
- 26.5 Bundling Modules
27. Metaprogramming with Functions
- 27.1 Understanding Metaprogramming
- 27.2 The Function Constructor
- 27.3 Using Proxies for Function Control
- 27.4 Reflect API
- 27.5 Decorators (Experimental)
28. Asynchronous Patterns with Functions
- 28.1 Callback Hell and Solutions
- 28.2 Promises Chaining
- 28.3 Async Iteration with `for await...of`
- 28.4 Error Handling in Async Patterns
- 28.5 Combining Different Async Patterns
29. Security Considerations
- 29.1 Avoiding `eval` and `new Function`
- 29.2 Input Validation
- 29.3 Secure Coding Practices
- 29.4 Handling Sensitive Data
- 29.5 Regular Updates and Dependencies
30. Custom Error Types in Functions
- 30.1 Creating Custom Error Classes
- 30.2 Throwing Custom Errors
- 30.3 Enhancing Error Information
- 30.4 Logging Errors
- 30.5 Best Practices in Error Design
31. Working with Function Contexts
- 31.1 Context Binding
- 31.2 Event Handler Context
- 31.3 Context in Asynchronous Code
- 31.4 Arrow Functions and Context
- 31.5 Advanced Context Manipulation
32. Function Factories
- 32.1 Creating Functions Dynamically
- 32.2 Practical Use Cases
- 32.3 Managing State with Closures
- 32.4 Performance Considerations
- 32.5 Testing Function Factories
33. Internationalization with Functions
- 33.1 Localization Functions
- 33.2 Formatting Numbers and Dates
- 33.3 Handling Multiple Languages
- 33.4 Accessibility Considerations
- 33.5 Libraries and Tools
34. Interacting with the DOM
- 34.1 Selecting Elements
- 34.2 Event Listeners
- 34.3 Dynamic Content Creation
- 34.4 Performance Optimization in the DOM
- 34.5 Frameworks and Libraries
35. Functional Design Patterns
- 35.1 The Module Pattern
- 35.2 The Revealing Module Pattern
- 35.3 The Observer Pattern
- 35.4 The Middleware Pattern
- 35.5 The Strategy Pattern
36. Advanced Topics
- 36.1 Transpilers and Function Syntax
- 36.2 WebAssembly and JavaScript Functions
- 36.3 Functional Reactive Programming (FRP)
- 36.4 Serverless Functions
- 36.5 Integrating Functions with DevOps
37. Conclusion and Next Steps
- 37.1 Recap of Key Concepts
- 37.2 Further Learning Resources
- 37.3 Practice Projects
- 37.4 Staying Current with JavaScript
- 37.5 Final Thoughts

14. Functions are First-Class Citizens

In this section

Functions as Values: Understanding First-Class Functions in JavaScript
Explore the concept of functions as first-class citizens in JavaScript, enabling them to be assigned to variables, passed as arguments, and returned from other functions.
Storing Functions in Data Structures: Arrays and Objects
Learn how to store functions in arrays and objects, and explore practical examples and use cases in JavaScript.
Functions Returning Functions in JavaScript
Explore how JavaScript functions can generate and return other functions, enhancing code reuse and modularity.
Callback Functions in JavaScript: A Beginner's Guide
Explore the world of callback functions in JavaScript, understand their role in asynchronous programming, and learn how to implement them effectively.
Practical Examples of First-Class Functions in JavaScript
Explore real-world applications of first-class functions in JavaScript, focusing on event handling and asynchronous code.

Fuad Efendi

View the page source Edit the page History

Sunday, November 17, 2024

13. Object Methods and `this`

15. Constructors and the `new` Keyword