We’re using Universally Unique Lexicographically Sortable Identifier (ULID) in our projects to identify entities. ULIDs are unique, sortable identifiers similar to UUIDs. The claim that ULIDs are better than UUIDs is that they are sortable, keeping a monotonic sort order, encoded as a 26-character string (36 characters for UUIDs) …

You may have seen JavaScript printing [object Object] when casting an object to a string. The [object Object] notation doesn’t give you information about the kind of object. You have to guess what object could cause this printing. This is where Symbol.toStringTag is helpful and this tutorial shows …

Converting plain JavaScript objects to strings results in '[object Object]'. This string representation isn’t helpful when debugging issues or looking for details. You can print details for an object when using a JSON string. But you don’t always want to print an object in a JSON …

In some situations, you need the number of days within a month. For example, when displaying statistics for each day of a month or when calculating a value with the unit “per day”. This tutorial shows you how to retrieve the number of days in a month using JavaScript. {{outline} …

Working with dates in an application requires you to think of time zones. Users are going to access your application from different time zones. They expect displayed dates to either match their personal timezone or to contain the timezone information, a la UTC+02:00. A common approach to handling …

We’re using a small performance optimization in our code bases: caching computation results in local variables. Saving results in a local variable is borrowed from the memoization technique. Memoizing values improves the performance of function execution by storing the results and reusing them for a function call. This tutorial …

When writing code, you eventually want or need to change existing implementation. Changing existing code can have side effects for the application and you may need to refactor parts of the project which you didn’t plan to touch. Yet, it’s necessary to move forward and sunset old versions …

In the previous Future Studio tutorial, we looked into the details of what’s Symbol.iterator in JavaScript. Symbol.iterator is a global constant for the @@iterator property used by JavaScript’s iteration protocol. When looping through an iterable, for example, an array, JavaScript looks for the @@iterator property that …