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How to Update an Object in JavaScript: Keeping Existing Properties Intact

Learn how to update specific properties in an object while preserving the rest of the object's structure using JavaScript and React. --- This video is based on the question https://stackoverflow.com/q/69357336/ asked by the user 'Marinescu' ( https://stackoverflow.com/u/13859497/ ) and on the answer https://stackoverflow.com/a/69357422/ provided by the user 'VMMOORTHY' ( https://stackoverflow.com/u/16512168/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Update only an object from another object and keep the rest of parameters the same Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Update an Object in JavaScript: Keeping Existing Properties Intact When working with complex objects in JavaScript, especially in frameworks like React, it's common to face challenges when trying to update specific properties without altering the rest of the object's structure. In this post, we'll explore a real-world scenario where an object holds user-related information, and we need to update only parts of it. Understanding the Problem Consider the following object structure: [[See Video to Reveal this Text or Code Snippet]] You have a form that allows users to input their first name, company details, and the type of their next action. You already have functions in place to handle updates for firstname and company, but you're running into an issue when trying to update just the type property of nextAction while keeping the by property unchanged. The Current Functionality Here's the code snippet you've written for handling input changes: [[See Video to Reveal this Text or Code Snippet]] Here, you can see that the nextAction object's structure isn't intact when you're trying to update its type. This is the part that requires adjustments. The Solution To update only the type property within nextAction while keeping the by property unchanged, you'll want to utilize the spread operator effectively. Let's break this down: Correcting the nextAction Update Logic Replace your existing logic for updating nextAction type with the code below: [[See Video to Reveal this Text or Code Snippet]] Key Changes Explained Spread Operator: By using the spread operator ...values.nextAction, you're creating a copy of the existing nextAction object. This ensures that the by property remains unchanged. Updating Type: You directly set the new type with a new object that contains the updated id and name properties. This way, only the type is modified. Example Implementation Here’s a complete example within the handleInputValue function for clarity: [[See Video to Reveal this Text or Code Snippet]] Conclusion By leveraging the spread operator, you can efficiently update specific properties of an object in JavaScript without disrupting the overall structure of that object. This method is particularly useful while working with nested objects in React due to its simplicity and effectiveness. Mastering this technique will help you manage your state more cleanly and avoid bugs in your application. Next time you find yourself needing to update just a part of a much larger object, remember this approach!