16.18: Polymorphism in JavaScript - Topics of JavaScript/ES6

TL;DR

Polymorphism in JavaScript allows objects of different types to be treated as the same object and execute functions accordingly, even in a loosely typed language like JavaScript.

Transcript

• I've got one more topic here, about object orientated programming in ES6 with classes, and that is what is polymorphism? And what does polymorphism mean, and how is it applied in JavaScript? So just a review, the core idea of object orientated programming, creating a blueprint, a template as a class, that makes, that encapsulates a whole bunch of... Read More

Key Insights

• ❓ Object-oriented programming involves encapsulation and inheritance.
• 👻 Polymorphism allows objects to be treated as different types and execute relevant functions.
• 👻 JavaScript, being a loosely typed language, allows for flexible polymorphism.
• 🅰️ Strongly typed languages achieve polymorphism through explicit typing.
• 📚 The p5 library in JavaScript provides useful tools, such as the p5.Vector object, which can be extended through inheritance.
• 🌲 Understanding the prototype chain and inheritance tree is crucial for comprehending the hierarchy and relationships between objects.
• 🅰️ Polymorphism simplifies the management of arrays containing different types of objects.

Questions & Answers

Q: What is encapsulation in object-oriented programming?

Encapsulation refers to the idea of creating a class as a template that encapsulates both data and functionality together, providing a convenient package for objects.

Q: How is inheritance defined in object-oriented programming?

Inheritance allows a class to inherit properties or functions from another class while allowing for modifications and customization specific to the inheriting class.

Q: What is polymorphism in JavaScript?

Polymorphism in JavaScript means that an object can be treated as multiple types, such as a Confetti object or a Particle object, depending on what is convenient. The system can determine which functions to execute correctly.

Q: How does polymorphism work in a strongly typed language?

In a strongly typed language, polymorphism is achieved through explicit typing, where variables are declared with specific types. Objects can be treated as different types, and functions specific to those types can be executed.

Summary & Key Takeaways

• The core ideas of object-oriented programming include encapsulation, which involves creating a blueprint or template as a class to encapsulate data and functionality, and inheritance, which allows a class to inherit properties or functions from another class.

• Polymorphism in JavaScript means that an object can be treated as multiple types and the system can determine how to execute the correct functions based on the context.

• In a strongly typed language, polymorphism is achieved through explicit typing, where the type of a variable is declared and cannot be changed. However, JavaScript's flexible nature makes it less apparent.