Hackle Wayne (@hacklew) profile picture

Hackle Wayne

@hacklew

Experienced OO programmer turned functional advocate. workshops, conferences, blog, thoughts and rant

hacklewayne.com
Joined July 2012
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sequence get it? haskellers #haskell
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Newly blogged: Your Generics may be different than mine! types, strong intuitions and dark magic hacklewayne.com/your-generic…
Your Generics may be different than mine

Your Generics may be different than mine

"Generics", what does it mean?

hacklewayne.com
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Newly blogged: Constructive code - an aimless exploration Stigma, absolutism, colourfulness, constraints, factories - everything constructor. hacklewayne.com/constructive…
Constructive code - an aimless exploration

Constructive code - an aimless exploration

There is deplorable stigma around constructors: using new is bad. Always use a builder or factory methods.

hacklewayne.com
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If you want an electrician, don't hire the entire construction team. Because the #1 rule of dependency management: "Depend only on what's needed" It's simple, and your favourite IoC container mostly likely breaks it. Just blogged hacklewayne.com/down-isp-ioc…

DOWN, ISP & IoC: dependency rule #1, and how to stop lying code

If you want an electrician, don't hire the entire construction team.

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Blogging again after months: A Square IS A Rectangle - If Designed Correctly! hacklewayne.com/a-square-is-…

A Square IS A Rectangle - If Designed Correctly

An age-old example from Object-Oriented literature for the classic Liskov Substitution Principle is the much acclaimed "A square is not a rectangle".

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aight really? you be arrested for having too much fun there #haskell peeps...
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Blogged: ‘extends’ in TypeScript: inheritance, upper bounds, conditional, distributive and variance hacklewayne.com/extends-in-t… #typescript

extends in TypeScript: inheritance, upper bounds, conditional, distributive and variance

The keyword extends seems to be a big source of confusion for many TypeScript users. It's used for inheritance, generics upper bounds, conditional types - which feature the most confusing of all,...

hacklewayne.com
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This is amazing stuff! Check out Type Families in Haskell: The Definitive Guide by @serokell serokell.io/blog/type-famili…
Type Families in Haskell: The Definitive Guide

Type Families in Haskell: The Definitive Guide

Learn about type families, one of the most powerful type-level programming features in Haskell.

serokell.io
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If you get monads, but not yet the State monad, this one is for you! "...it brings non-local states, it encodes a function, and often appears to be dark magic." [blogged] State Monad: a bit of currying goes a long way hacklewayne.com/state-monad-… #Haskell
State Monad: a bit of currying goes a long way

State Monad: a bit of currying goes a long way

A friend asked me about the State Monad. He enjoyed a honey-moon with Monads such as Maybe, List and Either, but State appears to be next-level. It brings non-local states, it encodes a function, and...

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I can explain the state monad, but only without examples #haskell 🤦🏻‍♂️
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Convenience Driven Development: A story of two exceptions hacklewayne.com/convenience-…

Convenience Driven Development: A story of two exceptions

Some people say developers would go to incredible lengths to avoid passing an argument. This slightly altered version is no less true: language designers would go to incredible lengths to "help" us...

hacklewayne.com
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Blogged: Convenience Driven Development: the Grandfather Paradox and Equality hacklewayne.com/convenience-…

Convenience Driven Development: the Grandfather Paradox and Equality

Every time somebody raves about how cool the "grandfather paradox" is, I cannot hide my contempt. Come on, we programmers have had this figured out for ages, and it's all cookie talk.

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Fine intro to Quinary numbers and balanced ternary numbers after some hand-rolled solution. "Full of Hot Air" - Day 25 - Advent of Code 2022 Many thanks to @ericwastl for the amazing #AdventOfCode adventofcode.com/2022/day/25 #Haskell
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Much less stress knowing there won't be a new puzzle with every passing day 🤓 I just completed "Unstable Diffusion" - Day 23 - Advent of Code 2022 adventofcode.com/2022/day/23 #AdventOfCode #Haskell
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It’s Composition over Aggregation, not just inheritance! Freshly blogged hacklewayne.com/composition-…

Composition over aggregation, not just inheritance

One thing I love about category theory literature is the line of reasoning through "factorisation".

hacklewayne.com
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“given two similar abstractions, if abstraction B can be defined by extending abstraction A, then A is the "better" abstraction, because B is "factored" by A.”
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Not to forget a bit of controversy! Most enjoyable for the inquisitive, creative and thoughtful🤜🤛
NDC Conferences (@NDC_Conferences) profile pictureNDC Conferences
@NDC_Conferences31 Jan 2023
Sign up for @hacklew 2-day, hands-on, minds-on and conversations-on #workshop on #application #architecture and #code #design, this year at #NDCOslo #2023! #Earlybird offer ends Friday, February 17! ow.ly/5Wf850MFgJ7
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Folding a 6-faced paper box is just as interesting the puzzle itself, so I saved for much later... and IT IS FUN! "Monkey Map" - Day 22 - Advent of Code 2022 adventofcode.com/2022/day/22 #AdventOfCode #Haskell
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Just blogged: Libraries should not provide interfaces for Dependency Injection - and stop asking (and this may not be a very good question to ask.) hacklewayne.com/libraries-sh…

Libraries should not provide interfaces for Dependency Injection - and stop asking

A question many C# programmers ask is "why isn't this library providing interfaces for dependency injection?"

hacklewayne.com
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Relatively straightforward for #haskell maybe because parsing and evaluating expressions is one of the canonical examples? "Monkey Math" - Day 21 - Advent of Code 2022 adventofcode.com/2022/day/21 #AdventOfCode Note: "lave" is the reverse of "eval".
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