Who would have thought that Promise is also a part of functional programming?

Functional programming has been increasingly active lately. When I was interning last year, I bought a copy of “Functional Programming in JavaScript,” read through it hastily with only a vague understanding. After re-reading it this year, I’m writing this blog post to share my understanding of currying.

Chapter 1

1. Identify abstractions and build functions for them;
2. Use existing functions to build more complex abstractions;
3. Build even more complex abstractions by passing existing functions to other functions.