Sorting data is a common task in programming. JavaScript provides a .sort(comparator) method on arrays allowing you to sort data with custom comparator. A comparator represents a compare function determining which element comes before the other. When sorting integers, a custom compare function comes handy because you can ensure …

You may want to add different behavior for different input types when working with functions in Node.js and JavaScript. For example, if an input is a promise, you want to resolve it first before moving on with the actual processing. This tutorial shows you how to detect whether a …

GitHub Actions let you automate tasks on your repositories. For example, you can move your entire CI/CD pipeline to GitHub using Actions. You probably need a database when running your tests. MongoDB recommends using replica sets in production environments. You can push your testing environment as close to the …

Creating promises in Node.js or JavaScript is a common way to run an asynchronous task. There’s a gotcha that you need to be aware of: the global Promise object provides a constructor that requires an executor function. The promise executor is a function accepting two other functions: resolve …

Merging objects in JavaScript is a common task. For example, when starting an application you may load multiple configuration files and merge them into a single configuration object. This tutorial shows you how to merge objects in JavaScript. {{outline}} Merge Objects Merging objects in JavaScript is possible in different ways. …

When building tools that work with dates, you may want to provide a button that acts as a shortcut to increase a date by one week. Internally, your application still works with actual dates and you may want to calculate the date in one week. This tutorial shows you how …

Imagine a planning tool like a ToDo-list where you want to schedule a task due for tomorrow. Clicking a button “plan for tomorrow“ sets the due date to tomorrow. Your database still needs an actual date as the deadline. This tutorial shows you how to retrieve tomorrow’s date in …

When preparing a package release, you may want to preview the upcoming release locally. The NPM CLI has a handy command to create a tarball locally: {{outline}} Create a Local Release Package Running the npm pack command in a directory containing a package.json file will create a .tar.gz …