Eric Elliott on testing

https://medium.com/javascript-scene/tdd-the-rite-way-53c9b46f45e3

Redux in a single line of RxJS.

action$.scan(reducer, initstate).subscribe(renderer)

The scan() operator in RxJS is just like reduce() operator in most fuctional libraries except for one thing, it emits partial reductions continuously as a stream which you can subscribe to. This is applied to a stream of actions (actions$) and the reducer is a pure function which is applied to each action in turn with the signature.

(state, action) => newstate

The state is the “accumulator” of the reduction and scan() emits a stream of states as its output. The render object is an Observer which is like a listener with callbacks for next(value), error(err) and complete().

http://rudiyardley.com/redux-single-line-of-code-rxjs/

What would a programmer want to learn mathematics for?

Steve Yegge from before Google decided to hogtie him and put him in a gimp suit. He’s recently resurfaced and is blogging again but here’s one from the olden days.

http://steve-yegge.blogspot.com/2006/03/math-for-programmers.html

Web Workers have been a standardised part of the browser since IE10. It’s triangle shame that so few people program with them.

Workerize (by Jason Miller of Preact fame) enables you to easily fire off any function as an asynchronous worker thread.

https://github.com/developit/workerize/blob/master/README.md

Via Jay Gischer

Circa 1970

https://www.youtube.com/watch?v=Qx5Iawpm5Kg&feature=share

Another attempt to explain Haskell to the wilfully ignorant.

This post is an experiment I decided to attempt after conversations with Ben Lesh and some other folks. I will assume as little knowledge of Haskell as I possibly can here. Later we’ll talk about some tools we have in Haskell to make the pattern more conceptually compact.

https://argumatronic.com/posts/2018-01-23-the-nesting-instinct.html