# Prototypes: What Classes Are Made Of

Underneath every class, each object is linked to a prototype object that holds the shared methods, and JavaScript finds a property by walking that chain of links until it finds it or runs out.

![Cheat sheet: Prototypes: What Classes Are Made Of](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/4a2b2c7e9b0045d9841fe383cea63026.webp)

- Category: JavaScript
- Level: Freelancer
- Tags: Inherited Property, instanceof (javascript), JavaScript, OOP, Own Property, Prototype, Prototype Chain
- Updated: November 1, 2026

Source: https://www.ask-codey.com/cheat-sheets/javascript-classes-prototypes-cheat-sheet