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Table of contents
1.
Introduction
2.
Understanding the finally() Method
2.1.
Syntax of the finally() Method
3.
Using finally()
4.
Frequently Asked Questions
4.1.
What does the finally() method do in JavaScript?
4.2.
When should I use the finally() method?
4.3.
Is finally() required in a try...catch statement?
5.
Conclusion
Last Updated: Mar 27, 2024
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finally() Method in JavaScript

Author Gunjan Batra
0 upvote
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Speaker
Anubhav Sinha
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25 Jun, 2024 @ 01:30 PM

Introduction

In programming, handling errors effectively is critical for building robust applications. JavaScript provides several ways to deal with exceptions, one of which is the finally() method.

finally() method in JS

 This article will explore the finally() method, showing you its purpose, usage, and importance.

Understanding the finally() Method

finally() is a method used in conjunction with the try...catch statement in JavaScript. The try...catch statement allows developers to handle exceptions (errors) that might occur in their programs. The finally block contains code that will be executed regardless of whether an exception is thrown or not.

Syntax of the finally() Method

The syntax of the finally() method is simple:

try {
  // Try to execute this code
} catch (error) {
  // Handle any errors here
} finally {
  // This code gets executed no matter what
}

The try block contains the code that may potentially throw an exception, the catch block contains the code that will handle the exception, and the finally block contains the code that will be executed whether an exception is thrown or not.

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Using finally()

The finally() method is very useful in scenarios where certain cleanup operations need to be performed regardless of whether an operation was successful or not. Let's see a basic usage of finally() method:

let message = '';
try {
    throw new Error('An error occurred!');
} catch (error) {
    message = 'Caught an error: ' + error.message;
} finally {
    message += ' Always keep going!';
}
console.log(message);

Output

Output

In this example, an error is thrown in the try block, and the catch block catches and handles the error. Regardless of the error, the finally block appends the string ' Always keep going!' to the message, which is then logged to the console.

Frequently Asked Questions

What does the finally() method do in JavaScript?

The finally() method in JavaScript contains code that is always executed, regardless of whether an error is thrown or not.

When should I use the finally() method?

Use the finally() method when you want to run some code after a try...catch block, regardless of the outcome.

Is finally() required in a try...catch statement?

No, finally() is not required, but it can be helpful when you need to run some cleanup code that must execute no matter what.

Conclusion

Understanding and utilizing the finally() method in JavaScript can help create more reliable and maintainable code. It guarantees certain actions are performed, regardless of whether operations in the try...catch block succeed or fail. As a developer, knowing how and when to use such techniques can elevate your error handling capabilities and make your applications more resilient.

To learn more about JavaScript, we recommend reading the following articles:

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