Observable.of is not a function

Observable.of is not a function: A Quick Guide to Fix the Issue

Are you having trouble with the "Observable.of is not a function" error message popping up in your code? Don't worry, you're not alone! Many developers encounter this issue when trying to import and use the Observable.of function from the rxjs/Observable library.

Understanding the Problem

Let's break down the problem and understand why this error occurs. The Observable.of function is part of the older version of RxJS, and it has been deprecated in the newer versions. The latest versions of RxJS now use the pipeable operators, making Observable.of redundant.

Solution 1: Update to the Latest RxJS Version

The simplest solution to fix this issue is to update your RxJS version to the latest one. Open your project's package.json file and locate the rxjs dependency. Update the version number to the latest stable release. Once you save the file, your package manager (npm or yarn) will install the new version of RxJS.

"dependencies": {
  "rxjs": "^7.0.0"
}

After updating, you should no longer receive the "Observable.of is not a function" error.

Solution 2: Use the Pipeable Operators

If for some reason, you cannot update to the latest RxJS version, you can use the pipeable operators instead. These operators are more flexible and offer a powerful way to compose and transform your observable streams.

To use the pipeable operators, you need to import them individually. Here's how to rewrite your code using the pipeable of operator:

import { of } from 'rxjs';

return of(res);

By importing the of operator directly from 'rxjs', you can now use of as a standalone function without the need for Observable.of.

Call-to-Action: Engage and Share Your Experience

Now that you have learned how to fix the "Observable.of is not a function" error, it's time to put it into action. Try using one of the solutions mentioned above and see if it resolves your issue.

Share your experience by leaving a comment below. Did the solutions work for you? Was there something else you tried? Your insights may help others who are facing the same problem.

If you found this guide helpful, consider sharing it on your favorite social media platforms. Help other developers who might be struggling with this issue find a quick solution too.

Keep coding, keep learning! 👩‍💻👨‍💻