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 …

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 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 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 …

TypeScript has the keyof and typeof keywords allowing you to retrieve related keys and types of a value or type. We used the combination keyof typeof in tutorials here on Future Studio showing you how to get all enum keys and how to use a string as enum key. This …

TypeScript enums are similar to JavaScript objects. They store a named set of constants. Enums can also store a key-value pair. You can access the values with a string-like value. It’s “string-like” because enums are more strict in types and require a specific string value: one of the available …