JavaScript has support for iteration protocols. These iteration protocols aren’t built-in implementations, but protocols outlining the convention that an implementation needs to follow. The Iteration protocol allows custom JavaScript objects to provide iteration behavior, for example how they provide values when looping over them in a for…of loop. …

In some situations, you want to remove a property from a JavaScript object. This could be an in-memory cache and you want to remove a cache key from that object. Or you don’t want to store a given property when writing an object as a JSON string to the …

JavaScript supports for await...of loops to iterate over async and sync iterables. The async iterator protocol has a similar interface as the synchronous iterator protocol. The difference is that the returned value from an async iterable is wrapped in a promise. This tutorial shows you how to determine whether …

In some situations, you must ensure that a given value is of a certain type. For example, you may have an options object supporting different properties. Some of them are expected to be numbers. You’re validating the input values and ensuring the given values are numbers and values in …

We’re working on the new Future Studio website. We migrated data to MySQL and used TINYINT(1) columns to store boolean values. An ORM reads data from MySQL and we added convenience methods on models to determine whether a given value is true or false. We’re translating the …

We’re working on the new Future Studio website. We’re migrating data from the previously used document database RethinkDB to MySQL. RethinkDB allowed us to store boolean values. MySQL stores boolean values as TINYINT(1). During the data migration from RethinkDB to MySQL we transferred all boolean values to …

JavaScript arrays come with dozens of helpful methods. Chaining methods is also possible because some of the methods return an array instance, too. That means you can create your array pipelines and adjust the values to your needs by filtering, mapping, sorting, and so on. But some of the array …

Promises are a construct in programming languages for asynchronous operations. A promise acts as a proxy for a result that is initially unknown because the computation is not yet complete. The JavaScript ecosystem had promise implementations before it became part of the language itself. For example, when and Bluebird are …