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JavaScript

A collection of 7 posts

How to validate a URL with Node JS

How to validate a URL with Node JS

Recently I needed to validate http links with Node. I thought this should be easy, and it is. Luckily for us, Node has a built in URL module that can help us to this. This is the snippet(not the final one): const URL = require('url').URL // 1 function validateUrl(

How to compare dates with TypeScript or JavaScript

How to compare dates with TypeScript or JavaScript

In this tutorial we will learn how to compare dates with TypeScript or JavaScript. Working with dates can be a painful experience but comparing them is not too bad as it works the same way as general object comparisons. We will start by looking at dates and how they work

How to pretty-print JSON with JavaScript

How to pretty-print JSON with JavaScript

In this tutorial I will show you how you can pretty print a JSON string. It is a one liner, but it makes all the difference. Normally when we use JSON.stringify, we only want to serialise a JSON object, but sometimes after we serialise it, we might want to

How to find duplicates in an Array with JavaScript

How to find duplicates in an Array with JavaScript

In this tutorial I will show you how you can check if an Array contains duplicate elements, but also, we will look at how you can return the elements that are duplicates. Both techniques focussed around the Set data type. Let's start with the data that will use in both

How to get the index from for-of loop with JavaScript

How to get the index from for-of loop with JavaScript

In this tutorial I will show you two ways that you can get the index when using a for-of loop. Let's start with the data that I will be using: const shoppingList = [ 'bread', 'milk', 'pie', 'juice' ] Option 1: .keys() The first and easiest way to get the index with a

How to run Async Await in Parallel or serial with JavaScript(Node)

How to run Async Await in Parallel or serial with JavaScript(Node)

In this tutorial I will show you how you can easily run async/await in parallel. It seems to me that we often forget the power of async await, which comes from being able to run multiple async tasks/jobs/functions at the same time. In order for us to

How to convert a byte array to String with JavaScript

How to convert a byte array to String with JavaScript

In this tutorial I will show you how you can convert a byte array to a string using JavaScript. I was busy with a task recently that required me to do this, luckily, JavaScript makes this easy with the built in String.fromCharCode() function. Let's see how we can use