Why Learning to Code is So Damn Hard
In this post, I'll walk you through the four phases of the typical journey into coding and what you'll need to do to survive each of them.
Related cards:
Why UML Fails to Add Value to the Design and Development Process « Learning Lisp
UML is applying an abstraction at the wrong end of the problem. It is primarily used to sketch object models for inferior languages.
Why you can't use timezone codes like "PST" or "BST" for Time objects
Rails' ActiveSupport::TimeWithZone objects have both a timezone code and offset, e.g. Thu, 28 Mar 2019 16:00:00 CET +01:00. Ruby's stdlib TZInfo also has time zones, but with different identifiers.
Unfortunately, not all timezone codes can b...
How to write good code comments
Code comments allow for adding human readable text right next to the code: notes for other developers, and for your future self. You can imagine comments as post-its (or sometimes multi-sheet letters ...) on real-world objects like cupboards, ligh...
How to write modular code
Or: How to avoid and refactor spaghetti code
Please note that I tried to keep the examples small. The effects of the methods in this card are of course much more significant with real / more complex code.
What are the benefits of more modular ...
Rails: Example on how to extract domain independent code from the `app/models` folder to the `lib/` folder
This cards describes an example with a Github Client on how to keep your Rails application more maintainable by extracting domain independent code from the app/models folder to the lib/ folder. The approach is applicable to arbitrary scenarios...
Why a Rails flash message is shown twice
You set a flash message and it shows up as it should. However, it is displayed again the next time you follow a link. Here is why:
You have to differentiate between a render and a redirect_to because a flash message is only deleted after a re...
How to check if a file is a human readable text file
Ruby's File class has a handy method binary? which checks whether a file is a binary file. This method might be telling the truth most of the time. But sometimes it doesn't, and that's what causes pain. The method is defined as follows:
How to use Simplecov to find untested code in a Rails project with RSpec and Cucumber
Simplecov is a code coverage tool. This helps you to find out which parts of your application are not tested.
Integrating this in a rails project with rspec, cucumber and parallel_tests is easy.
- Add i...
How to Make Your Code Reviewer Fall in Love with You
Why improve your code reviews?
Improving code review technique helps your reviewer, your team, and, most importantly: you.
Learn faster: If you prepare your changelist properly, it directs your reviewer’s attention to areas that support you...
Ruby: How to convert hex color codes to rgb or rgba
When you have a hex color code, you can easily convert it into its RGB values using plain Ruby.
>> "#ff8000".match(/^#(..)(..)(..)$/).captures.map(&:hex)
=> [255, 128, 0]
You can use that to implement a simple "hex to CSS rgba value ...