Mihai Târnovan mtarnovan

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	`O(log n)`
Search	`O(log n)`
Insertion	`O(n)` for <= 32 elements, `O(log n)` for > 32 elements [2]
Deletion	`O(n)` for <= 32 elements, `O(log n)` for > 32 elements

This lets you load application JavaScript asynchronously from <head>. Compatible with Turbolink v2, v5.0, v5.1, jquery-turbolinks, and no Turbolinks. Compatible with all browsers and IE9+ (only IE10+ will actually benefit from this though).

How to use this:

Add the HTML snippet just before the closing </body> tag.
Add the on_page_load.js script to the beginning of your application.js, and use window.App.onPageLoad(...) instead of document.addEventListener('DOMContentLoaded', ...) and jQuery(($) -> ...) everywhere.
Include your JavaScript like so:
```
<head>
```

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	defmodule Mix.Tasks.ConvertToVerifiedRoutes do
	@moduledoc """
	Replaces routes with verified routes.
	Forked from
	https://gist.github.com/andreaseriksson/e454b9244a734310d4ab74d8595f98cd

	This requires all routes to consistently be aliased with
	alias MyAppWeb.Router.Helpers, as: Routes

	Run with

	defmodule MyApp.Repo.Migrations.AddPostgresTriggerAndFunctionForAllTables do
	use Ecto.Migration

	def up do
	# Create a function that broadcasts row changes
	execute "
	CREATE OR REPLACE FUNCTION broadcast_changes()
	RETURNS trigger AS $$
	DECLARE
	current_row RECORD;

	#!/bin/bash

	name=$RANDOM
	url='http://localhost:9093/api/v1/alerts'

	echo "firing up alert $name"

	# change url o
	curl -XPOST $url -d "[{
	\"status\": \"firing\",

	###
	###
	### UPDATE: For Win 11, I recommend using this tool in place of this script:
	### https://christitus.com/windows-tool/
	### https://github.com/ChrisTitusTech/winutil
	### https://www.youtube.com/watch?v=6UQZ5oQg8XA
	### iwr -useb https://christitus.com/win \| iex
	###
	### OR take a look at
	### https://github.com/HotCakeX/Harden-Windows-Security

	# Elixir has pipes `\|>`. Let's try to implement those in Ruby.
	#
	# I want to write this:
	#
	# email.body \| RemoveSignature \| HighlightMentions \| :html_safe
	#
	# instead of:
	#
	# HighlightMentions.call(RemoveSignature.call(email.body)).html_safe
	#

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'