Ruby Functional Programming

Videos

• RubyConf 2019 - The Functional Rubyist by Joe Leo
• RubyConf 2015 - A Muggle's Guide to Tail Call Optimization in Ruby by Danny Guinther
• Object Oriented Programming vs Functional Programming - Continuous Delivery
• "O.O.P. Looks Like Functional Programming When Done Right!" - Continuous Delivery - Michael Feathers

Articles

• Functional programming - Wikipedia
• Functional Programming Paradigm - geeksforgeeks
• Functional Programming In Ruby- Ruby guides
• Functional programming in Ruby - womanonrails

High order and First class functions

• First-class function - Wikipedia
• Higher-order function - Wikipedia
• The Ultimate Guide to Blocks, Procs & Lambdas - Jesus Castello

Function composition

• Proc << and >> - ruby-doc
• Proc#compose and Enumerator#chain - Brandon Weaver

Closures

• Closures - Mozilla
• Functional Programming in Ruby — Closures - Brandon Weaver
• Closures in Ruby - geeksforgeeks
• Ruby Blocks Simplified - Julianna Roen from Gusto

Curry and partial function execution

• Proc#curry - ruby-doc
• Partial Application and Currying - riptutorialr

Referencial transparency

• Referential transparency - Wikipedia
• I/O in pure functions - Wikipedia
• I/O monad (Haskell) - Wikipedia
• Pure Functions and I/O - Alvin Alexander
• Immutable Enumerators with Tom Stuart

Recursion

• Tail Call Optimization in Ruby - Nithin Bekal

Lazy evaluation

• Infinite Sequences in Ruby - Ross Kaffenberger
• How Lazy Evaluation Works in Ruby - Gernot Gradwohl
• Enumerator - ruby-doc
• Enumerator::Lazy - ruby-doc

Extra

• dry-monads
• Pattern Matching