In Javascript, we have numerous ways to check if something is or is not a number. This is a particularly common task in Javascript, where there is dynamic typing, resulting in some unexpecte...
Centering Elements in CSS with Tailwind
Written by Johnny
Tailwind is an increasingly popular and widely used framework, which makes it easier in some cases to build and ship features and products. In this guide, we'll be covering how you can verti...
Getting Started with Redis and Node.JS
Written by Johnny
Redis is a powerful tool for caching data and having it available in memory. Redis requires RAM to use, and every piece of data you use in Redis is loaded into the RAM. That means it can be...
There are many use cases where knowing if an array is a subset of another can be quite useful - and although usually immediately obvious to the human eye, it can be difficult to evaluate in...
Javascript Array Every Method
Written by Johnny
Sometimes with arrays, we want to test every element for a certain condition. While individual conditions can be tested easily with an `if` statement, it becomes a little trickier with multi...
Universally Unique Identifiers (UUIDs) are used all over the place in software development for everything from identifying object elements to DOM elements on a web page. They are unique, 128...
Javascript Array Concat Method
Written by Johnny
The `concat` method on arrays is used to take two arrays and concatenate them into one. It takes as many arrays as you like - so you can concatenate many arrays at once: ```javascript Array....
Immediately invoked function expressions, or IIFE, are functions which are run as soon as you define the function. You may also see people refer to them as anonymous functions. They give us...
There are quite a few ways in Javascript to loop through an array of items or any other iterable item in Javascript. You may have seen them: - `arr.forEach()` - `for(let item of arr)` - `fo...
One of the most frequent operations we perform on an array is removing the last element. There are a few different ways to do this - but one of the most common is to use the `pop()` method....
Git: Renaming a Branch
Written by Johnny
Git [branches](https://fjolt.com/article/git-branches) are an easy way to manage our code, and separate our copies of our code when we want to work on specific features. We can then merge ou...
Git provides a powerful tool by letting us create [branches](https://fjolt.com/article/git-branches). When our branch is done, we'll often want to merge it back into our `main` or `master` b...
Resolving Git Merge Conflicts
Written by Johnny
Merge conflicts are often a part of life for working on complex development projects. In this guide we'll look at how you can deal with them, and when they will occur. ## When do merge conf...
A Step by Step Guide to Git Branches
Written by Johnny
In my previous guide on [getting started with git](https://fjolt.com/article/git-getting-started-with-git-init), I briefly covered how git branches work. You can create new branches using th...
Proxies are objects in Javascript which allows you to make a proxy of an object, while also defining custom behaviour for standard object operations like `get`, `set` and `has`. What that me...
Git can be daunting to understand since it is completely driven from the terminal, but at its core it's just version management software. It lets us maintain versions of code, which other pe...
What are NodeLists, and how do they work?
Written by Johnny
Did you know that Javascript does not class a selection of multiple elements as an array? Instead, it is something called a `NodeList`. A node list is essentially a list of elements. To gene...
Javascript Array Filter Method
Written by Johnny
The filter method in Javascript creates a shallow copy of an array, filtering it based on a number of conditions. It accepts a callback function. The array which `filter` produces will usual...
Javascript Array Reduce Method
Written by Johnny
The Javascript reduce method is a recursive way to perform a computation based on every element in array, while also taking into consideration the previous element in the array. It accepts a...
Javascript Array Slice Method
Written by Johnny
The `slice` method on arrays returns a shallow copy of a part of an array. It takes two numbers, a `start`, and an `end`. Every array has a `slice` method. Here is a quick example: ```javasc...
If you're new to web development, or just Javascript development, you may find yourself wondering **what is the difference between TypeScript and Javascript?**. In this guide I'll explain ex...
The Essential Guide to Javascript Sets
Written by Johnny
In a previous article, I covered [Javascript Maps](https://fjolt.com/article/javascript-map-data) - a data type very similar to objects, but with some key differences. Javascript has other d...
When we create components in React, normally they exist within the component tree. This is mostly fine, but sometimes we want certain parts of a component to appear **outside the component t...
When developing projects and products in Node.JS, it becomes essential to set the Node.JS version being used on your computer. `nvm` is a really useful tool for changing your Node.JS version...