Articles about Ruby, the language
A Ruby hash is a way to store and structure data. Let’s see how to define a hash and how to use it. And the main methods and operations, through examples. What is a hash and how is it different from an array? Hashes, just as arrays, can be understood as lists of data that …
If you are not familiar with the pattern matching feature in Ruby, this article is a good recap of the basics and it also includes some useful tips for developers. What is pattern matching? If you are new to the feature, welcome to the typical “Pattern matching journey”; where first, you don’t know what it …
In this article we will explore the self keyword of the Ruby language What is self in Ruby self is a reserved keyword in Ruby that always refers to the current object and classes are also objects, but the object self refers to frequently changes based on the situation or context. So if you’re in an instance, self refers to …
Let’s see how to get a random number in Ruby rand() method Ruby’s rand method belong to the kernel module. Which means you could use it in any Ruby’s environment. For example, if you want to emulate a dice roll, you would write : Note that without range, output will be from 0 to N. random_number Another …
With the Ruby language, block, procs, and lambda are some different ways to use anonymous functions. Why the need for anonymous functions ? Ruby is a language that uses multiple programming paradigms, most commonly object-oriented and functional, and with its functional nature comes the idea of functions. Ruby uses three types of closures : blocks, procs, and …
In Ruby, object methods are public by default, while data is private. To access data, we use the accessor method. Let’s start from a simple example. 1. Without any attr_accessor And then, create a new object of type Book : This seems okay so far. When we create our book object, the initialize function will execute, setting …
Ruby – attr_accessor, attr_writer, and attr_reader Read More »
How to define constants in Ruby, and how to use them – with one tricky part. Motivation We don’t have a lot of Ruby constants in the bootrAils starter. However, it’s always good to know how they work when the need arises.“Constants” are variables that are not meant to be changed. Let’s see how. In this article …
Ruby regexes are not so easy to grab. We tried to make this little tutorial as simple as possible. In this guide, we are going to learn all about Ruby Regex. They are actually called Ruby Regular Expressions, and they should not be confused with Pattern Matching. If we just think generally, the regular expressions are …
How to get milliseconds in Ruby ? Let’s explore 3 scenarii. 1. Display time, down to milliseconds in Ruby If you want more info about strftime, please read this article : https://www.bootrails.com/blog/ruby-strftime-short-and-long-story/ – milliseconds, however, were not covered at this time 🙂 2. Get current time system in milliseconds First possibility is to use .strftime, again : Please note …
“strftime” stands for “string from time”. Which means “please Ruby format the time into a human-friendly format”. Let’s see how. strftime for the impatients Sometimes examples worth a thousand words, so here are some that could help you right away (example inspired from APIDoks) : And a lot more of raw examples (explanations in paragraphs …