This document discusses functional programming concepts in JavaScript including first-class and higher-order functions, pure functions, lazy evaluation, and recursion. It examines if JavaScript is functional enough and provides examples of pure JavaScript functions like map, filter, and reduce. It also covers currying and the Ramda library, showing how it uses immutability and automatic currying through examples of adding numbers with and without currying.

1. Functional Javascript

2. Functional Programming
• First-class and higher-order functions
• Pure functions
• Lazy evaluation
• Recursion

3. Is Javascript functional?
functional enough.

4. Pure Javascript Functions
• Array.prototype.map - converts array to a new
array
• Array.prototype.filter - remove elements from
array
• Array.prototype.reduce - converts values from an
array into one value

5. Map / Filter / Reduce
Demo Filter + Map
Demo Reduce

6. Currying
• Break down a multiple argument function to a
function that takes part of the arguments

7. Ramda
• Immutability is at the heart of the design
• All the functions are automatically curried

8. Ramda - adding
Demo - addition vanilla JS
Demo - addition with currying