Скачать или смотреть How to Fix Your Custom Setter Method in JavaScript

Learn how to properly define and use setter methods in JavaScript, ensuring effective modification of object properties.
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This video is based on the question https://stackoverflow.com/q/63515209/ asked by the user 'Piero' ( https://stackoverflow.com/u/14140509/ ) and on the answer https://stackoverflow.com/a/63515282/ provided by the user 'Hien Nguyen' ( https://stackoverflow.com/u/4964569/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding JavaScript Object Methods: A Guide to Custom Setters

In the world of JavaScript, understanding how to work with objects and their properties is essential for any budding programmer. One common issue among beginners is getting custom setter methods to work correctly. If you're trying to modify an object's attribute through a custom method but getting unexpected results, you're not alone. Today, we’re tackling this problem by dissecting a typical scenario that many new developers face.

The Problem

Imagine you're creating an Animal object in JavaScript, designed to have a name property that you can set using a method called setName. However, when you attempt to use this method, it doesn’t work as expected. Here's the code that might be causing you confusion:

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As you can see, while myDog.setName appears to hold the value "Max", neither the name property nor the intended function is working as you expected. Let's break this down to understand why that is and how we can fix it.

The Solution

1. Understanding Function Assignment

In the above code snippet, the mistake lies in the way the setter method is being invoked. Instead of calling the method directly, you assigned a string value to myDog.setName. This doesn’t call the function but rather overwrites the function with a string. Hence, the original function no longer exists at myDog.setName, leading to unintended results.

2. Correct Usage of the Method

To correctly use the setter method you've defined, you should call the method as follows:

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3. Updated Code Example

Here’s how the complete and corrected version of the code will look:

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This time, when you run this code, you will see the output of console.log(myDog.name) will return "Max" as expected. Let's summarize the key points:

Always call the method using parentheses ().

Avoid overwriting function pointers with new values.

Conclusion

By understanding how to correctly implement and invoke custom setter methods in JavaScript, you'll be able to effectively manage your object properties. Remember, coding is often about practicing and refining your approach. Don't hesitate to experiment with different ways to invoke methods as you learn!

With a solid foundation in method usage, you can build more complex objects and behaviors in your JavaScript applications.

Happy coding!