JavaScript allows you to split strings into an array of string values at individual characters. A hidden functionality is splitting a string into a list of characters. And that’s what this tutorial shows you: how to split a given string value into a list of its individual characters. It …

You may need to read files from a local hard disk in your Node.js project. A typical use case when interacting with files is to read the content as a string. This tutorial shows you how to read a file’s content as a string using Node.js {{outline} …

ESLint comes with support to require or disallow trailing commas. This option is also known as “comma-dangle”. Trailing commas are supported in JavaScript by ECMAScript v5. Here’s a simple example: const futurestudio = { team: ['Marcus', 'Norman', 'Christian'], } The comma after team: ['Marcus', 'Norman', 'Christian'], is a trailing comma. This tutorial …

A previous tutorial showed you how to create a JavaScript Map instance from an existing object. This time we’re doing it the other way around: transforming a JavaScript map into a plain object. {{outline}} Create a JavaScript Object From a Map Modern JavaScript engines ship with the Object.fromEntries( …

The ECMAScript 2015 specification introduced a Map class. A Map instance provides convenient methods around key-value-pairs. Objects in JavaScript are key-value-pairs as well. Yet, you can’t pass an existing object to the map constructor. This tutorial shows you how to create a JavaScript map from an existing object. {{outline} …

In a recent project, we needed to calculate differences between data points. Each data point represented an amount of money. The difference between the two data points should always be a positive number in context with prices going up or down. This tutorial shows you how to always retrieve a …

Sometimes you want to pick a random item from a JavaScript array. For example, when picking a winner from a list of participants. Or when highlighting one of your product’s great features. This tutorial shows you how to grab a random array item in JavaScript. {{outline}} Get a Random …

Leaving a loop early is a common practice in programming. Stopping or breaking out of an Array#forEach iteration in JavaScript is only possible by throwing an exception. Also, the Mozilla Developer Network states “when you need to stop forEach, it’s the wrong tool.” This tutorial points you to …