🔐 How to authenticate your users in Express using Firebase

⛓️ Enforcing the shape of an API response with zod

Ever wondered how to cancel the execution of a timeout or an interval in JavaScript? You might have faced the case where you don't need the executions of any of these functions anymore. Both setTimeout and setInterval return an id that you can use it later as parameter for clearTimeout and clearInterval functions respectively. This will stop further executions once and for all.

⛵️ A lost boat, a radar and how to implement a binary search in JavaScript

🦜 Twitter API: From username to userId with JavaScript

The conditional operator is a JavaScript expression that evaluates and returns one of two expressions depending on a specified condition.

❓ The conditional operator in JavaScript

Understanding Enums in TypeScript. What are their default behaviour, string and numeric enums. How are they compiled into JavaScript

🎛️ Enums in TypeScript

Understanding the loose equality operator in JavaScript by showing an example of comparing a String with a Number

〰️ Why does ‘’ == 0 returns true in JavaScript?

This is an easy way of retrieving the list of files for a given directory in NodeJS

🗄️ Getting a list of files in a directory with NodeJS

Here are 5 different ways to create an Array in Javascript.

5️⃣ 5 ways of creating an Array in JavaScript

You've heard about React hooks and you start to get a grasp on it, you understand what the main ones do and use them effortlessly in your components. It's time to level up and to start creating your custom hooks to contain the business logic of your application.

🪝 Creating a custom React hook

Have you ever wanted to create gradient text as the following? With Tailwind CSS you can achieve it witih just 5 classnames. bg-gradient-to-r, from-cyan-400, to-emerald-500, bg-clip-text and text-transparent

🌈 Generating gradient text with Tailwind CSS

Express is a web framework for NodeJS that enables the development of web servers to be used for a variety of applications. From a simple API endpoint to a web server with a rendering engine. The way the business logic is executed in the Express application is with middleware functions.

🔀 Understanding Express' middleware functions

This is an easy way of setting up an in-memory key-value cache with expiry time in JavaScript. It is based on a plain JavaScript object and you can store value with the put method which will store the value along with the timestamp.

💾 Simple in-memory cache with JavaScript

Here's an easy way of summing all the digits of a given number in JavaScript: First, we need to get the digits separately, for this we can convert the number to a string of base 10, spread all the characters in an array and map those characters to the equivalent number.

➕ Summing all digits of a number with Array.reduce

This is how you can resolve the DNS of a website and get the IP address under which the page rests. Node provides the dns module and in this example we are using the promises implementation so we don't have to pass callbacks to the functions.

📇 Checking DNS records in Node

⏱ Cancelling setTimeout and setInterval executions

This is how you can sort an array of objects by a given key. The sort method accepts a function that takes two parameters, the two items of the array that is going to be sorted, and must return a number. If the returned number is greater than 0 it means that the second item should go before the first one. If the returned number is less than 0 it means that the first item should go before the second one. If the returned number equals 0 it means that both items are the same in sorting terms.

🗝️ Sorting an array of objects by a given key

If you want to create an array in JavaScript of a given length you can use the Array constructor plus the fill method combined.

📏 Create an array of a given length in JS

Sometimes you'll need to store some configuration variables that shouldn't be placed directly in the code because of security reasons (you might store your DB password here) or because they need to change depending on the deployment stage (the url endpoint of the DB might be different)

Bits of JS

🔐 How to authenticate your users in Express using Firebase