Learning Functional Programming with JavaScript ES6+

Introduction

• Functional programming will change the way you think about code
• What you should know
• Basic setup

1. Introductory Functional Concepts

• The goal of functional programming
• Declarative vs. imperative programming
• Immutability
• Separation of data and functions
• Converting object-oriented to functional code
• First-class functions
• Ensuring immutability with ESLint
• Installing and setting up ESLint
• Ensuring immutability: Finalize ESLint

2. First-Class Functions

• JavaScript arrow function syntax
• Using functions as data
• Creating arrays of functions
• Passing functions as arguments
• Returning functions
• Understanding closure
• Higher-order functions
• Tour of CoderPad
• Solution: More higher-order functions

3. JavaScript Array Manipulation

• Basics of functional data manipulation
• The spread operator
• Using the map() function
• Using the filter() function
• Using the every() and some() functions
• Preventing mutation with the slice() function
• Using the sort() function
• Using the reduce() function
• Combining array functions
• Solution: Recreating the map() function

4. Advanced Functional Concepts

• Currying and partial application
• Recursion
• Memoization

5. Code Conversion Challenges

• Solution: Count occurrences
• Solution: Anagrams

Conclusion

• Next steps in your ES6+ journey