Arpit Shah collegeimprovements

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

No, your cryptocurrency cannot work

Whenever the topic of Bitcoin's energy usage comes up, there's always a flood of hastily-constructed comments by people claiming that their favourite cryptocurrency isn't like Bitcoin, that their favourite cryptocurrency is energy-efficient and scalable and whatnot.

They're wrong, and are quite possibly trying to scam you. Let's look at why.

What is a cryptocurrency anyway?

There are plenty of intricate and complex articles trying to convince you that cryptocurrencies are the future. They usually heavily use jargon and vague terms, make vague promises, and generally give you a sense that there must be something there, but you always come away from them more confused than you were before.

	config :wps, WPSWeb.Endpoint,
	live_reload: [
	notify: [
	live_view: [
	~r"lib/wps_web/core_components.ex$",
	~r"lib/wps_web/(live\|components)/.*(ex\|heex)$"
	]
	],
	patterns: [
	~r"priv/static/(?!uploads/).*(js\|css\|png\|jpeg\|jpg\|gif\|svg)$",

	<.flash_group flash={@flash} />
	<main>
	<%= @inner_content %>
	</main>

	<%!-- We're doing teleport because navigation is rendered in root layout which is not updated --%>
	<%!-- Notice "hidden" class, it's important because we're not really teleporting content, but duplicating it --%>

	<div :if={@current_user} id="onboarding-render" phx-hook="teleport" data-teleport-target="onboarding" class="hidden">
	<MyApp.Onboarding.onboarding current_user={@current_user} />

	# lib/party_web/components/example_component.ex
	defmodule PartyWeb.ExampleComponent do
	@moduledoc """
	An example LiveComponent under test.
	"""
	use Phoenix.LiveComponent

	def render(assigns) do
	~H"""
	<div>

	defmodule MyApp.Books.Book do
	use Ecto.Schema
	import Ecto.Query, warn: false
	import Ecto.Changeset
	import MyApp.ChangesetHelpers

	schema "books" do
	field :name, :string

	field :genres, {:array, :string}, default: []

	# example from the ecto guides https://hexdocs.pm/ecto/test-factories.html

	defmodule MyApp.Factory do
	alias MyApp.Repo

	# Factories

	def build(:post) do
	%MyApp.Post{title: "hello world"}
	end

	{
	"version": "2.0.0",
	"tasks": [
	{
	"label": "Build",
	"type": "shell",
	"command": "mix compile",
	"problemMatcher": ["$mixCompileError", "$mixCompileWarning"],
	"group": {
	"kind": "build",

	# TODO: Extract into it's own library
	defmodule AbsintheSocket do
	require Logger
	alias Phoenix.Channels.GenSocketClient
	@behaviour GenSocketClient

	@control_topic "__absinthe__:control"

	defdelegate fetch(term, key), to: Map
	defdelegate get(term, key, default), to: Map

	iex(1)> Foo.Correspondence.validate_number("234-555-6789")
	{:ok, "Verizon Wireless", "mobile"}