chris montgomery montchr

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

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 mu

Nix String and Path Concatenation

From Bas van Dijk:

To understand these things I would recommend using nix-repl:

$ nix-repl
Welcome to Nix version 1.11.2. Type :? for help.

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

	{-# LANGUAGE RecordWildCards, Arrows #-}

	import Numeric
	import Data.Char

	import Control.Monad
	import Data.Monoid ((<>))
	import Data.List (nub, sort, reverse)

	data RepeatBounds = RB

	<code_scheme name="Airbnb">
	<option name="RIGHT_MARGIN" value="100" />
	<option name="HTML_ATTRIBUTE_WRAP" value="4" />
	<option name="HTML_ELEMENTS_TO_INSERT_NEW_LINE_BEFORE" value="" />
	<option name="HTML_ENFORCE_QUOTES" value="true" />
	<DBN-PSQL>
	<case-options enabled="false">
	<option name="KEYWORD_CASE" value="lower" />
	<option name="FUNCTION_CASE" value="lower" />
	<option name="PARAMETER_CASE" value="lower" />

	-- A global variable for the Hyper Mode
	k = hs.hotkey.modal.new({}, "F17")

	-- Trigger existing hyper key shortcuts

	k:bind({}, 'm', nil, function() hs.eventtap.keyStroke({"cmd","alt","shift","ctrl"}, 'm') end)

	-- OR build your own

	launch = function(appname)

	;; Enable ligatures without prettify-symbols

	(provide 'add-pragmatapro-symbol-keywords)

	(defconst pragmatapro-fontlock-keywords-alist
	(mapcar (lambda (regex-char-pair)
	`(,(car regex-char-pair)
	(0 (prog1 ()
	(compose-region (match-beginning 1)
	(match-end 1)

	#!/bin/bash
	# Generate a Markdown change log of pull requests from commits between two tags
	# Author: Russell Heimlich
	# URL: https://gist.github.com/kingkool68/09a201a35c83e43af08fcbacee5c315a

	# HOW TO USE
	# Copy this script to a directory under Git version control
	# Make the script executable i.e. chmod +x changelog.sh
	# Run it! ./changelog.sh
	# Check CHANGELOG.md to see your results

	# In order for gpg to find gpg-agent, gpg-agent must be running, and there must be an env
	# variable pointing GPG to the gpg-agent socket. This little script, which must be sourced
	# in your shell's init script (ie, .bash_profile, .zshrc, whatever), will either start
	# gpg-agent or set up the GPG_AGENT_INFO variable if it's already running.

	# Add the following to your shell init to set up gpg-agent automatically for every shell
	if [ -f ~/.gnupg/.gpg-agent-info ] && [ -n "$(pgrep gpg-agent)" ]; then
	source ~/.gnupg/.gpg-agent-info
	export GPG_AGENT_INFO
	else

	linters:

	SelectorFormat:
	convention: ^(_)?[a-z]+-[a-z0-9-]+((_{2}\|-{2})?[a-z0-9-]+)?(-{2}[a-z0-9-]+)?[a-z0-9]$
	convention_explanation: 'should be written in namespaced, hyphenated BEM format'
	ignored_types: [element]