Musings, Back-end and Ruby

• Rails loads the I18n, you need to load it outside of Rails with I18n.load_path += Dir["#{app_path}/config/locales/**/*.yml"] Reference
• File.realpath("symlink_path") to get the target of a symlink. Reference

• Removing a scaffold in Rails: rails d scaffold SCAFFOLD_NAME.

• Habitat: used for the app, Chef: used for provisioning the server.
• 10 Common Software Architectural Patterns
  • Layered: Subtasks, each of which is at a particular level of abstraction. Presentation/application/business logic (domain)/data access (persistence).
  • Client-server.
  • Master-slave: used in DB replication.
  • Pipe-filter pattern: Each step is ran through pipes, and can be used to sync or for buffering.
  • Broker: Structures distributed systems with decoupled components. A broker is responsible for the coordination of communication among components. Servers publish their capabilities to a broker: clients request a service from the broker, and the broker then redirects the client to a suitable service from its registry.
  • Peer-to-peer.
  • Event bus: Sources publish messages to channels on a bus, and listeners are notified.
  • MVC.
  • Blackboard.
  • Interpreter: SQL, languages used to describe communication protocols.
• alias vs alias_method: Reference, Reference
  • If you implement alias, when you call the aliased method in a child class, the child class calls the aliased method in the parent class.
  • Ruby style guide: “prefer alias when aliasing methods, so it communicates to the user that your alias will not be altered at runtime or by any subclass unless explicit.”
  • alias is a keyword and is lexically scoped: it treats self as the value of self at the time the source code was read.

class User

  def full_name
    puts "Johnnie Walker"
  end

  def self.add_rename
    alias :name :full_name
  end
end

class Developer < User
  def full_name
    puts "Geeky geek"
  end
  add_rename
end

Developer.new.name #=> 'Johnnie Walker'

• On skills:
  • Side projects, contributing to open-source, hacking on Github, enthusiasm for cool shit/software.
  • Learn about code quality, show that you care about it.
  • Teach the world that developers are more than their resumes.
  • Of course, experience matters, but it’s not everything.
  • 15 years of experience, of 1 year of experience repeated 15 years in a row?
• Readline in the Ruby library: require 'readline'
• parslet: Parsing expression grammar?

• Regex: ^ as not?

• DAS 83: Test cases vs example
  • Hamster vector library?
  • Representing test cases not as things that happen, but as human-readable output.
  • You can put test helpers to make the thing terse/readable.
  • By doing shit like def_delegator, it’s testable literally by doing an alias anyway.

  • If you can rewrite a class such that the value just relies on everything inside of it, why not?

  • Bitcoin mining inside of a Browser?

Reading Serverless Stack Book

• Amazon Cognito. Wow. Amazon really does a lot of things.
• DynamoDB: Is this
• CloudFront: Create distribution, has custom error responses.

Musings, React

• When to state and when to props?
  • Props flow downward from the parent component.
  • When a component receives data from someone other than the parent, we can use state.
  • State: for data that will change.
• Medium posts: I like gists for this, for interpolation shit.