A Quick Reminder About JavaScript Scopes

What is a scope?

Scope gives the ability to limit access to a variable or function and prevent meddles. What does that mean?

Take a look at the example below:

The visibility of two , count and run2 is limited to function border. They are accessible inside the function scope, but inaccessible outside:

Why Is Code Complexity an Important and Serious Topic?

“The central enemy of reliability is complexity. Complex systems tend to not be entirely understood by anyone. If no one can understand more than a fraction of a complex system, then no one can predict all the ways that system could be compromised by an attacker.” — Practical Internet Security by John R. Vacca

If it’s complex, it’s incomprehensible. If it’s incomprehensible, it’s unexplainable. If we can’t understand and explain the code, we can’t extend or change it. …

What’s Functional Programming?

Functional programming is a pipeline of pure functions.

What does that mean?

To understand this definition, we will use a real-life example. Let’s assume that we have a shipping warehouse and a large store containing a variety of products (books, clothes, certain canned food products, household appliances, etc.).

How do things work inside our warehouse?

Introduction

In this article, I’ll talk about modularity: What is modularity? Why is it important? And how can we measure modularity?

Modularity consists of dividing a system into separate and independent parts called groups or modules.

Design and code for the future

Introduction

A day in the life of developers

Testimonials from code reviewers

What we will do ?

Project

We will try to make an Online Bookstore.

Possible use cases

• get all books
• get a book details
• get all categories
• get all authors
• get books by category
• get books by author
• search a book by its name or author
• add a review : comment and rating
• update a review : comment and rating
• user can order one or many books

Constraints

• a book can have only one author
• a book can be associated only one category
• a book can have zero to many reviews
• an order can contains the same book only once time but with quantity from one to max
• user can…

In this story, we will see together the different aspects of Elixir Pattern Matching: tuples, list, map and multiclause function.

Tuples

Let’s assume that we have a function that return the gps coordinates (latitude, longitude) for a given country : get_gps_coordinates.

defmodule ElixirPatternMatching.Examples do
  def get_gps_coordinates(country) do
    %{
      France: {46.71109, 1.7191036},
      Spain: {40.2085, -3.713},
      Italy: {41.29246, 12.5736108}
    }[country]
  end
end

This function return a Tuple : { latitude, longitude }.

Let’s call this function to get the gps coordinates for ‘France’ :

defmodule ElixirPatternMatching do
  import ElixirPatternMatching.Examples,
    only: [get_gps_coordinates: 1]

  {latitude, longitude} = get_gps_coordinates(:France)

  IO.inspect("latitude :  #{latitude}")
  IO.inspect("longitude : #{longitude}")
end

…

WASM (WebAssembly) or not in frontend projects ?

What I want to do ?

I’m trying to find approach to enhance the performance of my frontend projects.

My frontend projects are mostly websites for many and different purposes.

I have always complex logic to do like filtering and transforming big backend response in frontend side. Sometimes I must use the generic Rest response and I can’t use graphql nor adding a BFF.

I add these complexities :

• complex UI/UX rules.
• supporting multiple browsers.
• 3G, 4G, …
• responsiveness and good user experience.

How can my frontend handle these complexities and keep running !

Some technics that I…