- 09 October 2016
- Patterns Ruby Design
- Ruby - Strategy Pattern
- 07 October 2016
- Patterns Ruby Design
- Decorator pattern and usage of SimpleDelegator
Recently I wrote about template pattern. Today I would like to talk about another useful pattern - decorator.
- 04 October 2016
- Patterns Ruby Design
- Inheritance and template pattern - simple example
Today I would like to show by simple example how to use template pattern in Ruby.
I'm sure you will find many ways of using that pattern in your application.
- 02 October 2016
- Ruby
- Ruby - Memoization
Hi. Today I would like to talk about memoization in Ruby.
But to begin, let's consider some abilities of Ruby. Often, we want to assign result of execution of function to some variable. If result of execution is false or nil we would like to assign some default value.
- 02 October 2016
- Ruby
- inject for work with collection in Ruby
After couple of theoretical posts (Tell, Don't Ask and Law of Demeter) I want to write about more practical things.
About something that we use on everyday's job dealing with arrays and hashes.
- 30 September 2016
- Patterns Ruby
- Tell, Don't Ask principle in Object-Oriented Programming
There is a great principle in object-oriented programming which says: "Tell, Don't Ask".
This principle tells that we should not ask object about their state, make decision and only then tell them what to do. Rather we should send commands.
There is a good quote about that:
- 10 September 2016
- Ruby Ruby On Rails
- Rails - Law of Demeter and delegate
Today's post will be more about Ruby On Rails and ActiveRecord. But first things first. If you didn't hear about Law of Demeter, I really recommend to read about it.
In general - it's a set of rules which bounds knowledge of modules about each other and allows you to reduce coupling of your system.
Here is how Wikipedia describes it:
- 28 August 2016
- Ruby
- Ruby 2 - Refinements
Refinements has been added to Ruby to replace popular, but bad approach called Monkey Patching.
Let's check what Monkey Patching is and why it is bad.
For example, we have a class User, which has method to_s:
- 26 August 2016
- Ruby
- Module#prepend in Ruby 2.0
The best way to understand how Module#prepend works is to figure out method lookup process in Ruby.
If it's a simple inheritance and method is present in parent class but not in a main class:
- 24 August 2016
- Ruby
- The easiest way to convert any value to Array in Ruby
Ruby is not a strong typed programming language, so methods can accept arguments of any type. But sometimes we want to make sure that value we accept is an Array.
I've seen many times that developers do something like that: