Have you ever wondered how JavaScript determines whether an object belongs to a given constructor? Enter the scene: the instanceof operator. Together with prototypes, they form the backbone of JavaScript's flexible yet robust type system.
In this post, we demystify the connection between prototypes and the instanceof operator through clear explanations and real-life examples.
Understanding Prototypes
As a quick refresher, prototypes allow JavaScript constructors to share data and behavior amongst themselves. Each constructor comes equipped with a special property, known as prototype, pointing towards a linked object containing shared keys and values accessible across all instances. For further details, refer to our blog post titled "Prototypal Inheritance in JavaScript."
The Instanceof Operator Explained
Now that we’ve brushed up on prototypes, enter the instanceof operator. Given an object and a constructor, instanceof evaluates to true if the object was instantiated from the…
