As you go along the way of learning javascript you hit the concept of closure. Unfortunately for me, it was in the beautiful learning process you go through during an interview. So I write this blog in hopes of increasing my understanding of the topic and hopefully that of my fervent readers.

What is a closure?

A closure in javascript is when functions are bundled together inside another function with references to its surrounding state similar to the following.

At first look, this brought confusion to me not because it was my first time seeing nested functions but because at first look I thought…

This a topic everybody runs into while learning to code, and that sometimes brings some confusion into this process. Although as confusing as it may seem, it is also quite simple, and learning it can help you take your coding to another level.

What are instance and Class Variables?

A class variable is a variable defined in a class body that can be interacted with without an instance of such class. Class variables are shared among all instances of the class and its subclasses.

An instance variable is also a variable defined in a class body but belongs to a specific instance. Its value is not…

One of the concepts that you find along the way to becoming a great Rubyist is the concept module. A module is a way to wrap methods, classes, constant in a unit, in a way similar to a Class with the difference that a module can’t be instantiated.

You are probably wondering “If they can be instantiated then what is the use of an module?”. Well, modules have two main uses.

1. Namespacing
2. Utilizing Ruby Mixin

Namespacing

Namespacing is in a way a kind of container for functions, classes, constants, modules, etc … The idea of this is to used this container…

While continuing on working on my skills and developing applications on ruby I got introduce to the service object model. The service object model helps you reduce the complexity of your controllers and code repetition.

The job of a service object is to encapsulate functionality, execute one service, and provide a single point of failure. A service object is just a Plain Old Ruby Object (“PORO”) that follows the following structure.

• Has an initialization method with a params argument.
• Has a single public method named call.
• Returns a payload or an error.

SimpleCommand is a Ruby Gem that makes it…

I recently had the amazing opportunity to of being interview for a customer support engineer position where I met amazing people and had the opportunity to learn new tricks for debugging using the developer’s tools. One of them was detecting the end-points a web page is connecting to fetch data and I decided to do a step by step on how to do that.

For the purpose of this tutorial, I am going to use one of the websites I have built since most websites in production can have a lot of information and could be a little difficult for…

One of the most popular ways of authentication use in rails 5 and higher is the token-based authentication, where a generated created when an user logs in and such token is pass with every request the user make to as a proof of identity to authorize access to resources in the server. In this guide I am going to show you how to quickly set up a token-base authentication API in Rails 6 using JWT and BCrypt gems.

Lets start by creating a new project

rails new api-app --api

Them let’s modify the cors.rb file so it can take cors.rb…

As I advance in my knowledge of python I decided to apply to a data engineer position at a prestigious finance company. Luckily I was selected from the pool of candidates and was entrusted with learning how to web scrap and use basic libraries like pandas to process the information scraped from the web. Today I’ve come to share what I learned during that process, and we are going to be web scrapping for data and creating pandas data frames to easily manipulate and present the data in the future.

The python library and Selenium WebDriver and we are going…

An enumerator is a class in ruby that supports internal and external iteratoration, although it looks more like a function that behaves like an iterator. The best part of an enumerator is that they are highly customizable.

(Full definition from Wikipedia): “A generator is a special routine that can be used to control the iteration behaviour of a loop. A generator is very similar to a function that returns an array, in that a generator has parameters, can be called, and generates a sequence of values. However, instead of building an array containing all the values and returning them all…