khusnetdinov

Learning Rust

The following is a list of resources for learning Rust as well as tips and tricks for learning the language faster.

Warning

Rust is not C or C++ so the way your accustomed to do things in those languages might not work in Rust. The best way to learn Rust is to embrace its best practices and see where that takes you.

The generally recommended path is to start by reading the books, and doing small coding exercises until the rules around borrow checking become intuitive. Once this happens, then you can expand to more real world projects. If you find yourself struggling hard with the borrow checker, seek help. It very well could be that you're trying to solve your problem in a way that goes against how Rust wants you to work.

khusnetdinov

---
# SSH server settings, in line with https://stribika.github.io/2015/01/04/secure-secure-shell.html
# Before using, change myhosts to your hosts' nickname and myuser to your username (two instances! make sure you replace both or you'll be locked out of ssh!)
- hosts: myhosts
  become: true
  remote_user: myuser
  tasks:
    # Key exchange, ciphers and MACs
    - lineinfile: dest=/etc/ssh/sshd_config regexp='^KexAlgorithms' line='KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256'
    

khusnetdinov

$ brew install libmagic
$ brew link libmagic  (if the link is already created is going to fail, don't worry about that)
$ env ARCHFLAGS="-arch x86_64" gem install ruby-filemagic -- --with-magic-include=/usr/local/include --with-magic-lib=/usr/local/lib/

khusnetdinov

1. Знание основ Ruby, фреймворка Ruby on Rails
 - http://guides.rubyonrails.org/
 - http://rusrails.ru/
 Вопросы:
 1. Чем отличается статическая и динамическая типизации в языках программирования?
 2. Какие виды наследования поддерживаются в Ruby?
 3. Что такое модуль? Какая разница между классом и модулем?
 4. Какие есть уровни контроля доступа к методам для классов и модулей?
 5. Какие есть способы вызова методов в Ruby?
 6. Что означает ключевое слово self?

khusnetdinov

(defun dotspacemacs/layers ()
  "Configuration Layers declaration.
You should not put any user code in this function besides modifying the variable
values."
  (setq-default
   ;; Base distribution to use. This is a layer contained in the directory
   ;; `+distribution'. For now available distributions are `spacemacs-base'
   ;; or `spacemacs'. (default 'spacemacs)
   dotspacemacs-distribution 'spacemacs
   ;; Lazy installation of layers (i.e. layers are installed only when a file

khusnetdinov

WITH table_scans as (
    SELECT relid,
        tables.idx_scan + tables.seq_scan as all_scans,
        ( tables.n_tup_ins + tables.n_tup_upd + tables.n_tup_del ) as writes,
                pg_relation_size(relid) as table_size
        FROM pg_stat_user_tables as tables
),
all_writes as (
    SELECT sum(writes) as total_writes
    FROM table_scans

khusnetdinov

• Dynamic Dispatch
• Dynamic Method
• Ghost Methods
• Dynamic Proxies
• Blank Slate
• Kernel Method
• Flattening the Scope (aka Nested Lexical Scopes)
• Context Probe
• Class Eval (not really a 'spell' more just a demonstration of its usage)
• Class Macros

khusnetdinov

Lambda: standard

# Creating a lambda
l = lambda { |name| "Hi #{name}!" }

# Executing the lambda
l.call("foo") # => Hi foo!

khusnetdinov

defmodule MyApp do
  use Application

  def start(_type, _args) do
    import Supervisor.Spec, warn: false

    children = [
      Plug.Adapters.Cowboy.child_spec(:http, MyApp.Router, [], [
        dispatch: dispatch
      ])

khusnetdinov

class BasketController
  def add_to_basket
    item = Item.find_by_title(params[:item_title])

    basket = $basket

    basket.add_item(item)

    if basket.count_items > 10
      basket.error_messages.add("Слишком много товаров в корзине")