Ruby for beginner series (7 of 11) — In real life, many objects that have common properties and habits, such as cars, motorbikes, trucks, and buses, all function as vehicles. Where they have the same characteristics as having wheels, there are machines, there are factories that make,…, how to implement the program so that the program codes for…

Ruby for beginner series (6 of 11) — In the process of learning object-oriented programs, there are many terms that often make students confused, for example the understanding and differences between objects, classes, instances, variables, instance variables, class variables. So in this practice will be explained in detail the meaning and difference Object, Instance, Variable, Class Object can be imagined as something…

Ruby for beginner series (5 of 11) — In a Ruby program, numbers, letters, dates, and other things are objects. In Ruby, there are several kinds of data types ranging from numbers to strings (letters), Arrays, true/false values, and data types that only exist in the Ruby program, namely symbols and hashes. Logical True / False In Ruby, there is no boolean…

Ruby for beginner series (4 of 11) — Looping is making a program that will be repeated. …

Ruby for beginner series (3 of 11) — In Ruby, if a logic has two or more answers, it must use branching logic. Ruby branching logic can use the if command or case statement. The if command is more commonly used than case. The case command sometimes has the advantage of being shorter. If a condition contains two…

Ruby for beginner series (2 of 11) — Ruby is an object-oriented program, so before learning more about how the Ruby program works, the first step needed is to direct the mindset to become object-oriented. In this topic, we will give an example of how to create a vehicle class, then determine the data used only. This process…

Ruby for beginner series (1 of 11) — For ruby installation, I would like to suggest you read this link, since it covers many operating systems. After success in installing Ruby, open your terminal / cmd (in windows)or you can use iterm2 in Mac OS. Check your ruby version by typing: ruby -v My suggestion is you create…

The Beauty of Design pattern Series (20 of 20) — The Proxy Pattern is about providing a placeholder for another object to control access to it. It basically creates an object that has a reference to the real object. Then when clients object or guests ask a request, this object will do the filtering (for example, a layer of security). …

The Beauty of Design pattern Series (19 of 20) — The composite design pattern consists of composing objects into tree structures and then working with these structures as if they were individual objects. The following is the code’s story. There are two classes below (person and group). A person class is represented as a leaf object, whereas a group class is represented as a branch or…