JavaScript Prototypes 2025 – The Complete Course

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Provider

Coursera
Pricing

Paid Course
Languages

English
Certificate

Paid Certificate Available
Duration & workload

12 hours 37 minutes
Sessions

On-Demand
Subtitles

English

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Overview

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Updated in May 2025. This course now features Coursera Coach! A smarter way to learn with interactive, real-time conversations that help you test your knowledge, challenge assumptions, and deepen your understanding as you progress through the course. Master the foundations and nuances of JavaScript’s prototypal inheritance system in this comprehensive course. You'll gain a deep understanding of how JavaScript handles object creation, inheritance, and the prototype chain, equipping you with practical skills to write more efficient and scalable code. The course begins by introducing key concepts like prototypal inheritance, hidden [[Prototype]] links, and how objects and functions interact with these structures. From there, you’ll explore instantiation patterns including functional, pseudoclassical, and ES6 class-based models, learning how to implement and optimize them through hands-on examples. Next, you’ll dive into the intricacies of the .prototype property, the __proto__ accessor, and their roles in building robust prototype chains. The course includes a practical project to create multi-level inheritance systems using various modern JavaScript approaches. You’ll also compare JavaScript's prototype-based model with class-based languages and composition techniques. This course is ideal for intermediate JavaScript developers looking to deepen their knowledge of object-oriented programming in JavaScript. A basic understanding of JavaScript syntax and functions is recommended. If you're comfortable with objects and functions but want to master inheritance and prototypes, this course is for you.

Syllabus

Introduction

In this module, we will establish a foundational understanding of JavaScript prototypes and how they shape the object-oriented paradigm in the language. You’ll explore the internal [[Prototype]] mechanics, examine the special behavior of functions, and see objects as the central actors in JavaScript. To bring theory into practice, we’ll wrap up with a project that connects all the key ideas.

The [[Prototype]] object

In this module, we will dive deep into the [[Prototype]] object and its hidden yet powerful role in JavaScript inheritance. You’ll uncover how prototype chains are formed, how properties and methods are inherited, and what happens behind the scenes with primitives and constructors. With real examples and important warnings, this section prepares you to handle prototypes with both confidence and caution.

Instantiation Patterns

In this module, we will explore the full spectrum of JavaScript instantiation patterns, from object literals to ES6 classes. You’ll learn how functional, prototypal, pseudoclassical, and class-based approaches differ, when to use each, and how to implement them effectively. This section equips you with practical knowledge and hands-on examples to help you choose the best pattern for your development needs.

__proto__ (aka: dunder proto)

In this module, we will take a focused look at __proto__, JavaScript's once-popular but now partly deprecated way of managing prototypes. You'll learn where it fits in the prototype chain, why it’s no longer recommended, and how to safely use modern alternatives. We'll also highlight common issues tied to __proto__ and how to avoid them in clean, future-proof code.

The .prototype property

In this module, we will demystify the .prototype property and its critical function in JavaScript's inheritance system. You’ll learn how it links constructor functions to their instances, understand its relationship to [[Prototype]], and explore key concepts like the constructor property and prototype chaining. By the end, you’ll have a clear mental model of how .prototype shapes object behavior across your code.

Practical Application - Building Your Own Prototype Chains

In this module, we will bring theory into action by building real prototype chains using multiple approaches—from classic constructor functions to modern ES6 classes. You'll create 3-level inheritance structures, tackle issues like constructor misreferences and code duplication, and explore the evolution of JavaScript inheritance techniques. This hands-on section ensures you're ready to apply prototype knowledge in real development projects.

Prototypal Languages vs Classical Languages

In this module, we will explore how inheritance is implemented differently across prototypal and class-based object-oriented languages. Through hands-on comparisons—including a "Hello World" example and Java code analysis—you'll gain clarity on how JavaScript’s prototypes diverge from traditional class structures. By the end, you'll confidently differentiate between these paradigms and understand their respective strengths.

Prototypes vs Composition

In this module, we will explore composition as a powerful alternative to prototypes in JavaScript. You'll learn how to shift from inheritance-based design to composition-based architecture, gaining flexibility and modularity. By the end, you’ll be equipped to choose the right approach—composition or prototypes—based on your project’s specific needs.

Outro

In this module, we will wrap up the course with a concise review of everything you've learned about JavaScript prototypes. From fundamental concepts to hands-on implementation, you’ll reflect on your progress and solidify your understanding. This final section sets the stage for confidently applying prototype-based thinking in your own projects.