HashemKhalifa

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it much simpler to think about both the old list and the new one, what they contain, and

HashemKhalifa

// === Arrays

var [a, b] = [1, 2];
console.log(a, b);
//=> 1 2


// Use from functions, only select from pattern
var foo = () => [1, 2, 3];

HashemKhalifa

#!/bin/sh
# https://sound.stackexchange.com/questions/26633/free-batch-conversion-from-flac-to-apple-lossless-alac
# https://stackoverflow.com/questions/55429909/could-not-find-tag-for-codec-h264-in-stream-0-codec-ffmpeg-flac-to-alac-conver
for name in *.flac; do \
  ffmpeg -nostdin -i "$name" -c:a alac -c:v copy "${name%.*}.m4a" && \
  ffmpeg -nostdin -i "$name" -vf "crop=((in_w/2)*2):((in_h/2)*2)" \
     "${name/%flac/jpg}" && \
  AtomicParsley "${name/%flac/m4a}" --artwork "${name/%flac/jpg}" --overWrite; \
done