JavaScript libraries take the legwork out of building complex applications. Here are some of the most useful libraries to use in 2021/2022. Once you’ve graduated from ‘Hello World!‘ and understand how JavaScript works, you’ll probably want to dive into building something more useful – a website, or a service, or a mobile app. These all have many moving parts – Authentication so users can log in, database support for storing data, file uploads so users can store their cat pictures in the database – all of these … Read more

When building a JavaScript application, you don’t need to write everything from scratch. Instead, javaScript frameworks provide the base to build your app. Here are the ones we’re using in 2021 and into 2022. Node.js https://nodejs.org/en/ JavaScript originated as a scripting language for use on web pages – to be executed within a web browser. Node.js breaks JavaScript out of the browser and allows it to run stand-alone. It’s not technically a framework, but you’ll need to know what it is as some frameworks will run … Read more

Here’s a short article that explains arrays and how to check if a JavaScript variable is an array using the Array.isArray() method. Want to check out whether an array contains a value? Find out how here. What is An Array? An array is a type of JavaScript variable that can hold other variables, or references to other variables, in a list at a certain position. Declaring an Array in JavaScript An array is declared in JavaScript the same way as any other variable – by assigning the value … Read more

What is null in JavaScript, and how can you check if a value is equal to null? Read on to find out. What is Null? Null is a term with a special meaning in computing and computer programming. Null is not 0 (zero). Null means that something has no value. Zero is a value (a number). An empty string has a value (though sometimes called a null string, they aren’t null). A variable with a value of null is considered to be empty. It is not undefined – it has been defined … Read more

Being able to remove duplicates from (or de-duplicate) an array is a useful thing to be able to do. Here’s how it’s done. What is an Array? In programming, an array is a type of variable that can hold other values, or references to other variables, in a list at a certain position. Arrays are vital to building any application – allowing you to store a list of variables or values of any length in a single variable – ready to be iterated over, processed, … Read more

JavaScript does not include a sleep function to pause execution – but you can achieve the same effect with this simple code. Unlike shell scripts and PHP, JavaScript does not include a built-in function to pause execution for a set amount of time. In other programming languages, this is usually called the sleep function. Unfortunately, JavaScript doesn’t have an equivalent function, but we can build one ourselves! JavaScript Promises Modern versions of JavaScript include support for new functionality called promises. Put simply; a promise is a new … Read more