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Chapter 1 - Object Oriented Design

The purpose of design is to allow you to do design later, and it's primary goal is to reduce the cost of change.

SOLID Design:

• Single Responsibility Principle: a class should have only a single responsibility
• Open-Closed Principle: Software entities should be open for extension, but closed for modification (inherit instead of modifying existing classes).
• Liskov Substitution: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
• Interface Segregation: Many client-specific interfaces are better than one general-purpose interface.

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                               Lesson 1 SUMMARY


  1. The cursor is moved using either the arrow keys or the hjkl keys.
         h (left)       j (down)       k (up)       l (right)

  2. To start Vim from the shell prompt type:  vim FILENAME <ENTER>

  3. To exit Vim type:     <ESC>   :q!   <ENTER>  to trash all changes.
             OR type:      <ESC>   :wq   <ENTER>  to save the changes.

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The Perfect Margarita

This is my "go to" margarita because of the ease of preparation and the simplicity of ingredients.

TL;DR

1oz orange liqueur, 2oz tequila, 3oz limeade, 1/2 lime, shaken with ice.

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I highly suspect that the RSpec core team all use black backgrounds in their terminals because sometimes the colors aren’t so nice on my white terminal

I certainly use a black background. I'm not sure about the other RSpec core folks. Regardless, if there are some color changes we can make that would make output look good on a larger variety of backgrounds, we'll certainly consider that (do you have some suggested changes?). In the meantime, the colors are configurable, so you can change the colors to fit your preferences on your machine. First, create a file at

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Code Review

What should we look for when doing code review? How should we receive code reviews from others?

thoughbot's Code Review guide is a great starting point. It articulates principles for the relational side of code review. This is especially relevant for us in a remote environment. How we give and receive feedback is as important as the feedback itself.

Things To Look For In Code Review

The following is a very incomplete list of questions to ask yourself during code review. The items here are meant to be starting points for a conversation with the code's author. Always assume the best intentions.

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You'll need to reinstall pow after updating the POW_DOMAINS env var (see http://pow.cx/manual#section_3.1 for more details).

echo "export POW_DOMAINS=test,local" > ~/.powconfig
curl get.pow.cx | sh

Now you should be able to access your local apps (that are being server by pow) at the .test domain.

See also: basecamp/pow#547

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An excerpt from Programming Phoenix by Chris McCord, Bruce Tate, and José Valim

---

You won’t find a "PhoenixDelayedJob" or "ElixirResque", those complex packages that exist only to spin off reliable processes as a separate web task.

You don’t need one. Don’t get us wrong. In Ruby, those packages are well-conceived and a critical part of any well-crafted solution. In Elixir, those frameworks turn into primitives. The Elixir programming model makes reasoning about concurrent systems almost as easy as reasoning about single threaded ones. When you have two database fetches, you won’t have to artificially batch them together with a stored procedure or a complex query. You can just let them work at the same time, like this:

company_task  = Task.async(fn -> find_company(cid) end)

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This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

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Solution

defmodule HistogramCup do
  @moduledoc """
  You are given an input list whose each element represents the height of a line towers.
  The width of every tower is 1. It starts raining. How much water is collected between the towers?

  Input: [1,5,3,7,2] , Output: 2 units
  Explanation: 2 units of water collected between towers of height 5 and 7

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')