Node.js ships with a file system module allowing you to interact with files on the local hard disk. The file system module fs provides two methods allowing you to rename files: Fs#rename and Fs#renameSync. This tutorial shows you how to rename a file synchronously and asynchronously using …

When interacting with the file system, you may want to check whether a file exists on the hard disk at a given path. Node.js comes with the fs core module allowing you to interact with the hard disk. This tutorial shows you how to use Node.js to determine …

It can be helpful to stop large test suites as soon as an error occurs. Stopping the test run after the first failed test saves you time, especially during development. Jest comes with a built-in feature to fail early if one test fails. This tutorial shows you how to configure …

We recently ran into a problem with a large array. The number of items in the array was too large to process them at once. We wanted to offload smaller chunks of these items to a queue worker. This tutorial shows you how to split an array into a list …

Modern development environments sometimes require more than a single command line tab to run a project. For example, you may have a compile step to bundle up the final JavaScript file that will be delivered to the browser. Besides the frontend compilation, you may start a frontend or backend server …

Arrays are a commonly used data structure in JavaScript applications. Arrays represent a list of items that you can manipulate to your own needs. You can add new items to an existing array with ease. This tutorial shows you three ways of appending new items to the end of an …

Arrays are a commonly used data structure in JavaScript. When interacting with arrays, you likely want to manipulate them by adding new items. In some situations, you may want to add items to the beginning of an array. This tutorial shows you three ways on how to prepend items to …

Interacting with data from third-party sources like APIs comes with challenges. You’re not in control of the data format and style. Sometimes, you wish to transform the data to your preferred style. This tutorial shows you how to transform the keys of an object into camelCase format. {{outline}} CamelCase …