tonymorris

Response to https://peerj.com/preprints/826v1/

1.

The method is dubious with respect to the conclusion.

The researchers do not analyse the code using any formal
or even established reliable methods. Instead, the metric that is used is "look
to see if some *detected* bug, which was fixed *post-release*.

tonymorris

• mount indicators
• install air filter
• install rear rack
• install braided fuel line
• install headlight protector
• mount spotlights
• install windscreen
• change oil filters
• install foam air filter
• adjust rear shock

tonymorris

Our web applications are getting increasingly more complicated. They are becoming more distributed and increasingly powered by combinations of complex, constantly changing and large datasets. All while users are increasingly more connected and want the latest information instantly without any slow page loads or stale information.

To address this, developers have turned to layers of caching and single page applications so that there are layers of aggregated and preloaded state as close to the user as possible, to be immediately available when it is requested. This comes at a high cost: it is very difficult to invalidate or update those caches when the upstream information changes. This is especially problematic when the stale caches can accidentally cause real bugs rather than show stale data to users.

The big issue here is that we're not just caching expensive-to-compute static data. We are caching data that changes over time. There are a number of architectual patterns that can be applied, but to date, n

tonymorris

Optics By Example Cheat Sheets

The following are appendices from Optics By Example, a comprehensive guide to optics from beginner to advanced! If you like the content below, there's plenty more where that came from; pick up the book!

• Operators
• Composition Guide
• Substitution Guide
• Optical Constarints and Types

Operator Cheat Sheet

tonymorris

import Data.Monoid

-- This code doesn't work... 
-- How can you make a multi-parameter data type be Foldable?

-- foldMap over `a` so it can be converted to a Monoid
data BinaryTree3 a v
  = Node3 a (BinaryTree3 a v) (BinaryTree3 a v)
  | Leaf3 a v
  deriving (Show)