Node.js ships with the native fs module to interact with the local file system. The fs module supports retrieving statistics for a file on your local disk. You may also get the size of a file from these statistics. This tutorial shows you how to retrieve the file size …

You can download a file in Node.js in different ways. Node.js comes with built-in functions to download and save a file to your local disk. You can combine the integrated https and fs modules to download files from the Internet. This tutorial shows you how to use native …

The JavaScript stdlib is missing a method to detect whether a given input is a string value in lowercase format. Yet, we can build our own isLowerCase method using the existing methods. This tutorial shows you how to create a method detecting whether an input is in lowercase. {{outline}} Determine …

JavaScript is missing a method to detect whether a given input is a string value in uppercase format. What’s existing are methods allowing us to create our own isUpperCase utility method. This tutorial shows you how to create a method detecting whether an input is in uppercase. {{outline}} Determine …

JavaScript contains the global Symbol object allowing you to create unique symbol values. You may use symbols to add a property to an object that doesn’t collide with other keys because symbols are hidden from the usual access patterns. This tutorial shows you how to detect whether a given …

A JavaScript object contains key-value pairs. Depending on your use case you may need to iterate through all these key-value pairs. JavaScript offers different types of loops to iterate through the object. The allrounder is the for…in loop. Since ECMAScript 2015 you can use Object.keys. Starting from ECMAScript …

JavaScript’s stdlib for strings contains dozens of methods. These methods are useful in a lot of situations. Yet, there are use cases where a method doesn’t exist in the stdlib. For situations where you want to retrieve the part of a string after the last occurrence of a …

JavaScript’s stdlib for strings comes with a solid foundation. It provides useful methods for common use cases. It can’t provide methods for every use case. Yet, you can build your own utility methods using the existing functionality. This tutorial shows you how to retrieve the part of a …