Скачать или смотреть Resolving the Uncaught TypeError: obj2.getName is not a function in JavaScript

A comprehensive guide to understand and fix the `Uncaught TypeError: obj2.getName is not a function` error in JavaScript.
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This video is based on the question https://stackoverflow.com/q/76143315/ asked by the user 'Manish' ( https://stackoverflow.com/u/5243169/ ) and on the answer https://stackoverflow.com/a/76143356/ provided by the user 'Zac Anger' ( https://stackoverflow.com/u/5774952/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Uncaught TypeError: obj2.getName is not a function Error in JavaScript

JavaScript developers often encounter various errors during their coding sessions. One such error that can be a little perplexing is the Uncaught TypeError: obj2.getName is not a function. This error typically arises when you are trying to access a method that is not defined in the object you're working with. In this post, we'll explore how this error occurs and how to fix it effectively.

The Problem Explained

Let's take a look at the provided code snippet that leads to this error:

[[See Video to Reveal this Text or Code Snippet]]

What is Happening Here?

Defining the obj Object:

The object obj has a property name and a method getName() that returns the value associated with name.

Using Prototype for obj2:

The second object, obj2, is meant to inherit from obj using the prototype chain.

The Error Occurrence:

The line console.log(obj2.getName()) throws an error because obj2 does not directly recognize the getName method from obj as it was incorrectly set up.

The Solution

To resolve this issue, we need to correctly set the prototype of obj2. Instead of _proto_, which is not a valid property in JavaScript for defining the prototype, we should use __proto__. Here's how to fix the code:

Step 1: Update the Prototype Definition

Change the prototype line in the obj2 definition from proto to __proto__:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Test the Code

Now, when you run this revised version of the code, obj2 should be able to access the getName method from obj:

[[See Video to Reveal this Text or Code Snippet]]

Final Code Example

Here’s the final working example with the corrected code:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In summary, the error Uncaught TypeError: obj2.getName is not a function occurs because of an incorrect prototype assignment. By utilizing _proto_ instead of _proto_, we enable obj2 to inherit properties and methods from obj. Mastering prototype usage in JavaScript is essential for effective object-oriented programming in this language. With this guide, you can confidently tackle and fix similar issues in your own coding projects.