113 Decks Ordered By Applause Count - Lowest First - Chse one - invert order

# Title Applauses  
1 ApplicativeError functions handling and recovering from errors: A mnemonic to recall their signatures from their names 5  
2 Point-free or Die - Tacit Programming in Haskell 7  
3 Test Doubles - Terminology, Definitions and Illustrations - with Examples - Part 1 7  
4 Non-strict functions, bottom, and Scala by-name parameters 7  
5 List Unfolding - 'unfold' as the Computational Dual of 'fold', and how 'unfold' relates to 'iterate' 12  
6 Folding Cheat Sheet #9 - List Unfolding - 'unfold' as the Computational Dual of 'fold', and how 'unfold' relates to 'iterate' 13  
7 The Nature of Complexity in John Ousterhout’s Philosophy of Software Design 13  
8 The Open-Closed Principle - Part 2 - The Contemporary Version - An Introduction 13  
9 Drawing Heighway’s Dragon - Part 3 - Simplification Through Separation of Concerns - Rotation Without Matrix Multiplication 14  
10 De Morgan's Laws are Monoid Homomorphisms 16  
11 Drawing Heighway’s Dragon - Part 4 - Interactive and Animated Dragon Creation 16  
12 The Open-Closed Principle - Part 1 - The Original Version 16  
13 Drawing Heighway’s Dragon - Part 2 - Recursive Function Simplification - From 2^n Recursive Invocations To n Tail-Recursive Invocations Exploiting Self-Similarity 18  
14 Function Composition - forward composition versus backward composition 19  
15 Year when lambda functions were introduced in various languages 20  
16 Symmetry in the interrelation of flatMap/foldMap/traverse and flatten/fold/sequence 20  
17 Monad as Functor with pair of Natural Transformations 21  
18 Functor Composition 22  
19 Addendum to `Monads do not Compose` 25  
20 Monad Transformers - Part 1 27  
21 Ad hoc Polymorphism using Type Classes and Cats 28  
22 Fibonacci Function Gallery - Part 2 28  
23 Scala 3 by Example - Algebraic Data Types for Domain Driven Design - Part 2 29  
24 Fibonacci Function Gallery - Part 1 29  
25 Monads do not Compose 30  
26 Sequence and Traverse - Part 2 30  
27 Functional Effects - Part 1 31  
28 Folding Cheat Sheet Series Titles 31  
29 A sighting of sequence function in Practical FP in Scala 34  
30 Sequence and Traverse - Part 1 34  
31 Sequence and Traverse - Part 3 34  
32 State Monad 34  
33 Sierpinski Triangle - Polyglot FP for Fun and Profit - Haskell and Scala 35  
34 Folding Cheat Sheet #7 - The three duality theorems of fold 35  
35 ‘go-to’ general-purpose sequential collections - from Java To Scala 36  
36 Functional Effects - Part 2 36  
37 Folding Unfolded - Part 5 36  
38 Folding Cheat Sheet #5 - Folding a list right and left using Cons and Nil results in the identity and reverse functions 36  
39 Monoids - Part 2 - With examples using Scalaz and Cats 36  
40 Folding Cheat Sheet #8 - Folding with monoids 36  
41 Side by Side - Scala and Java Adaptations of Martin Fowler’s Javascript Refactoring Example 37  
42 Left and Right Folds - Comparison of a mathematical definition and a programmatic one 37  
43 Monad Fact #5 37  
44 Functor Laws 39  
45 Game of Life - Polyglot FP - Haskell and Scala - Part 2 39  
46 Writer Monad for logging execution of functions 39  
47 Natural Transformations 39  
48 The Expression Problem Part 1 39  
49 Monoids - Part 1 - With examples using Scalaz and Cats 39  
50 Fusing Transformations of Strict Scala Collections with Views 39  
51 The aggregate function - from sequential and parallel folds to parallel aggregation 39  
52 Sum and Product Types - The Fruit Salad & Fruit Snack Example 40  
53 A sighting of traverseFilter and foldMap in Practical FP in Scala 40  
54 Game of Life - Polyglot FP - Haskell and Scala - Part 3 40  
55 The Monad Fact Series 40  
56 Arrive at monads by going from composition of pure functions to composition of effectful functions 41  
57 Folding Unfolded - Part 3 41  
58 N-Queens Combinatorial Problem - Polyglot FP for Fun and Profit – Haskell and Scala - Part 2 41  
59 A sighting of traverse_ in Practical FP in Scala 41  
60 The Uniform Access Principle 41  
61 Monad Fact #2 41  
62 Monad Fact #4 41  
63 Applicative Functor - Part 3 41  
64 Folding Unfolded - Part 1 42  
65 Function Applicative for Great Good of Leap Year Function 42  
66 The Sieve of Eratosthenes - Part 1 42  
67 Folding Cheat Sheet #3 - The universal property of fold 42  
68 Function Applicative for Great Good of Palindrome Checker Function 43  
69 N-Queens Combinatorial Problem - Polyglot FP for Fun and Profit – Haskell and Scala - Part 4 44  
70 Monad Fact #1 44  
71 The Expression Problem Part 2 44  
72 Scala 3 by Example - Algebraic Data Types for Domain Driven Design - Part 1 44  
73 Monad Fact #6 46  
74 Lambda Expressions and Java 8 - Lambda Calculus, Lambda Expressions, Syntactic Sugar, First Class Functions 46  
75 Folding Unfolded - Part 4 46  
76 Kleisli Composition 47  
77 Folding Cheat Sheet #2 - Programmatic and mathematical definitions of right fold and left fold 47  
78 Algebraic Data Types for Data Oriented Programming - From Haskell and Scala to Java 47  
79 Monad Fact #3 47  
80 Game of Life - Polyglot FP - Haskell and Scala - Part 1 48  
81 Applicative Functor - Part 2 49  
82 Quicksort - a whistle-stop tour of the algorithm in five languages and four paradigms 50  
83 Kleisli composition, flatMap, join, map, unit - implementation and interrelation - V2 updated for Scala 3 50  
84 Applicative Functor - Part 1 50  
85 N-Queens Combinatorial Problem - Polyglot FP for Fun and Profit – Haskell and Scala - Part 3 51  
86 Folding Cheat Sheet #6 - Left and right folds and tail recursion 52  
87 Computer Graphics in Java and Scala - Part 1b 54  
88 Folding Unfolded - Part 2 54  
89 Compositionality and Category Theory 54  
90 Folding Cheat Sheet #4 - For functions that can be defined both as a right fold and as a left fold, one may be more efficient than the other 55  
91 A Sighting of filterA in Typelevel Rite of Passage 56  
92 Computer Graphics in Java and Scala - Part 1 56  
93 From Subtype Polymorphism To Typeclass-based Ad hoc Polymorphism - An Example 57  
94 Refactoring: A First Example - Martin Fowler’s First Example of Refactoring, Adapted to Java 57  
95 Refactoring: A First Example - Martin Fowler’s First Example of Refactoring, Adapted to Scala 59  
96 Drawing Heighway’s Dragon - Part 1 - Recursive Function Rewrite - From Imperative Style in Pascal 64 To Functional Style in Scala 3 64  
97 Scala 3 enum for a terser Option Monad Algebraic Data Type 64  
98 The Functional Programming Triad of Folding, Scanning and Iteration - A first example in Scala and Haskell 65  
99 Tagless Final Encoding - Algebras and Interpreters and also Programs 66  
100 Folding Cheat Sheet #1 - Folding over recursively defined data structures for natural numbers and lists 70  
101 The Debt Metaphor - Ward Cunningham in his 2009 YouTube video 70  
102 Hand Rolled Applicative User Validation Code Kata 72  
103 Functional Core and Imperative Shell - Game of Life Example - Haskell and Scala 79  
104 Nat, List and Option Monoids - From scratch - Combining and Folding - An example 81  
105 The Sieve of Eratosthenes - Part 2 - Genuine versus Unfaithful Sieve 84  
106 From Scala Monadic Effects to Unison Algebraic Effects 84  
107 Scala Left Fold Parallelisation - Three Approaches 86  
108 The Functional Programming Triad of map, filter and fold 93  
109 N-Queens Combinatorial Problem - Polyglot FP for Fun and Profit – Haskell and Scala - Part 1 96  
110 Definitions of Functional Programming 98  
111 Direct Style Effect Systems - The Print[A] Example - A Comprehension Aid 100  
112 N-Queens Combinatorial Puzzle meets Cats 127  
113 Monad Laws Must Be Checked 237