Testing objects and asserting their equality can be tricky. For example, in integration tests where you’re sending HTTP requests to a server and receiving responses back. You may want to assert a subset of response headers to match a given expectation. You may not be in control of the …

In some situations, you want to dynamically access a property in a JavaScript object. You typically access dynamic properties using obj[key]. In situations where you want to access multiple properties, you would need to have multiple assignments for the individual properties. The good thing: you can also use JavaScript …

You want a solid and convenient experience when working with the file system in Node.js. The file system comes with its own challenges, like space limitations and access restrictions. Typically you also need to ensure a given state. For example, you want to delete all files from a given …

When interacting with dates in JavaScript you sometimes want to provide shortcuts. Like adding a week to a given date. Or moving today’s meeting two weeks into the future (keeping the day and time). That’s what this tutorial is about: adding a single week or multiple weeks to …

When interacting with data you may run into challenges related to code formatting. Your linter may warn about misalignments from returned objects of third-party libraries or data from APIs. You’re not in control of the data format and style. And yet you want to comply with your project’s …

When running a Node.js script you may need to ensure a given Node.js version that runs your script. This happens when you need a given feature that became available in a specific Node.js release. For example, you may require at least Node.js version 14.17.5 …

ECMAScript 2015 introduced the for..of and for..in loops. Both loops allow you to iterate through values in a different way. Please find more details on the differences of both loops in the dedicated tutorial. This tutorial focuses on how to determine whether a given value is actually iterable. …

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 …