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 …

It would be best if you had a way for users to share their thoughts when building a content-centric website. Users may comment on tutorials, videos, or other types of content. A common way of sharing comments is the HTML textarea that provides a multiline input field. Using textareas can …

We at Future Studio use TypeScript on the frontend and backend. The backend uses an ORM and related models to interact with data from the database. The database models define all accessible properties that are available in the serialized JSON. The frontend uses this JSON and we want to derive …

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 …