We recently ran into a challenge with a database design. The database schema includes multiple tables. The tables have foreign key references between each other. One of the tables uses a column that contains a comma-separated list of values where each value is a reference to a row in a …

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 …

Template literates in JavaScript are delimited with backticks and allow you to create string interpolation and multi-line strings. A multi-line string with template literals is convenient because you can add words and line breaks without concatenating strings using a + across lines. A downside of multi-line strings in template literals: it …

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 …