sjava

Learning Rust

Getting Started + Installation | Cheat Sheet

Table of Contents

1. How Do I Start Learning Rust?!
2. Ok, I Think I Know The Basics But How Do I Get Better?!
3. Rustlang Tooling
4. Helpful References Throughout Your Journey
5. The Rust Community
6. Recommended (but not free) Books & Courses

sjava

defmodule Hello.Repo do
  use Ecto.Repo,
    otp_app: :hello,
    adapter: Ecto.Adapters.Postgres

  @doc """
  Reverse a preload.

  ## Example

sjava

from datetime import datetime
import binascii
import logging
import io


def _parse_fields(raw):
    """Return a iterators of (id, value)."""
    raw = io.BytesIO(raw)
    while True:

sjava

NetworkManager WiFi Power Saving

NetworkManager supports WiFi powersaving but the function is rather undocumented.

From the source code: wifi.powersave can have the following value:

• NM_SETTING_WIRELESS_POWERSAVE_DEFAULT (0): use the default value
• NM_SETTING_WIRELESS_POWERSAVE_IGNORE (1): don't touch existing setting
• NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2): disable powersave

sjava

defmodule MyappWeb.AlbumController do
  use MyappWeb, :controller
  use Filterable.Phoenix.Controller
  import ShorterMaps
  alias Myapp.Accounts
  alias Myapp.Accounts.Album

  action_fallback(MyappWeb.FallbackController)
  filterable(Myapp.AlbumFilters)

sjava

FROM elixir:1.6.5

ENV NODE_VERSION 8.x
ENV NPM_VERSION 6.1.0
ENV PHOENIX_VERSION 1.3.2

RUN curl -sL https://deb.nodesource.com/setup_${NODE_VERSION} | bash \
  && apt-get install -y nodejs

RUN npm install npm@${NPM_VERSION} -g

sjava

# For each database:
ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
# For each table:
ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
# For each column:
ALTER TABLE table_name CHANGE column_name column_name VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
# (Don’t blindly copy-paste this! The exact statement depends on the column type, maximum length, and other properties. The above line is just an example for a `VARCHAR` column.)

sjava

defmodule XmlNode do
  require Record
  Record.defrecord :xmlAttribute, Record.extract(:xmlAttribute, from_lib: "xmerl/include/xmerl.hrl")
  Record.defrecord :xmlText, Record.extract(:xmlText, from_lib: "xmerl/include/xmerl.hrl")

  def from_string(xml_string, options \\ [quiet: true]) do
    {doc, []} =
      xml_string
      |> :binary.bin_to_list
      |> :xmerl_scan.string(options)

sjava

defmodule Crypto do
  def md5(data) do
    Base.encode16(:erlang.md5(data), case: :lower)
  end
end

sjava

//This is a WeChat miniprogram client transport for phoenix.js 
// so that you can use easily use Phoenix Channel as a WebSocket server.
// Written by @chrismccord
// example usage:
// ```
// let socket = new Socket("ws://localhost:4000/socket", { transport: WxSocket })
// socket.connect()
// let channel = socket.channel("room:lobby", {})
// channel.join()
//   .receive("ok", resp => { console.log("Joined successfully", resp) })