Salesforce JavaScript Developer Practice Exam

Do all objects in JavaScript have prototypes?

1. true

2. false

The correct answer is: true

In JavaScript, every object is linked to another object called its prototype. This relationship allows for the inheritance of properties and methods, facilitating a powerful mechanism for object-oriented programming. The prototype of an object serves as a blueprint from which the object can inherit features. This concept is central to JavaScript's object model, which uses prototypes instead of classical inheritance. When a property or method is called on an object, JavaScript first looks for that property or method on the object itself. If it cannot find it, JavaScript then checks the object's prototype chain, which consists of the prototype and the prototypes linked to it, until it either finds the property or reaches the end of the chain (null). It's important to note that even if an object is created using an object literal, it still has a prototype, which is the object from which it derives its properties and methods. Furthermore, in JavaScript, all objects inherit from the base object, including arrays and functions. Given this foundational aspect of how JavaScript operates, it is indeed accurate to state that all objects in JavaScript have prototypes.