pdmholden

# frozen_string_literal: true

# Rails 7.1.0.alpha
# Ruby 3.2.2

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

pdmholden

SE-Radio Episode 315: Jeroen Janssens on Tools for Data Science

http://www.se-radio.net/2018/01/se-radio-episode-315-jeroen-janssens-on-tools-for-data-science/

2018-01-23 / 2018-02-11

• Definition: extracting value from data; two forms:
  • Analysis that you make, giving additional insight.
  • Integrate into product (eg, recommendations in Netflix).
• What's different about data science from statistics? Statistics is a part of data science.

pdmholden

Public/Private/Protected

This is all about the receiver.

• Public is the simple case, these messages can be sent to any receiver, explicit or implicit.
  • Explicit: var_name.method_name; self.method_name.
  • Implicit: (inside a class, just calling method_name) because the receiver is self even though it's not "mentioned"
• Private methods, the receiver is always self. It is not possible to call var_name.method_name, ie, only implicit invocation is possible.
  • The result is that these methods can only be called (with implicit receiver) from within the class in which they are defined. But this is not about information hiding, it is about the receiver of the message.
• Protected methods are like private except that explicit receivers are allowed when the message is sent from a class of the same type.

pdmholden

This is a cheat sheet for RSpec, including its methods, and test doubles. It also includes FactoryGirl methods, even though that is separate from RSpec. This cheat sheet is based on Rails 4 Test Prescriptions by Noel Rappin (the best of a bad lot when it comes to RSpec books) and the RSpec documentation published on Relish. RSpec documentation is generally not very good, which is why I created this cheat sheet for myself.

General

Stubs

pdmholden

API levels:
  Nexus S:  10 (6%)
  Nexus 7:  17 (18%)
  ?         19 (39%)

Cameras:
  Open Camera
    http://opencamera.sourceforge.net/
    http://sourceforge.net/p/opencamera/code/ci/master/tree/