How to Sort an Array of Objects by Dates in JavaScript скачать в хорошем качестве

How to Sort an Array of Objects by Dates in JavaScript

Learn how to efficiently sort an array of objects by dates in JavaScript, grouping them into new arrays based on unique dates. --- This video is based on the question https://stackoverflow.com/q/72113878/ asked by the user 'Marin' ( https://stackoverflow.com/u/11761074/ ) and on the answer https://stackoverflow.com/a/72115292/ provided by the user 'Nelsongt77' ( https://stackoverflow.com/u/6882830/ ) 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: How to sort array of objects by dates and make new arrays which will contain all objects with same date 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 Sort an Array of Objects by Dates in JavaScript Sorting arrays of objects by dates can be a common task in programming, especially when working with data that requires organization. In this guide, we will tackle a specific scenario in JavaScript: how to sort an array of objects based on their date properties and subsequently group those objects by unique dates into separate arrays. The Problem Suppose you have an array of objects where each object contains a name and a date. The challenge is to take this array and create new arrays that contain all objects that share the same date. Here’s the initial array of objects for reference: [[See Video to Reveal this Text or Code Snippet]] Your goal is to transform this array into a format where objects with identical dates are grouped together, producing an output like this: [[See Video to Reveal this Text or Code Snippet]] The Solution Using .reduce() To achieve this organization, we can make use of JavaScript's powerful .reduce() method to consolidate the array of objects. This method is perfect for accumulating or transforming data into the desired shape. Step-By-Step Breakdown Initialize the Reduce Function: We want to start with an empty object as our accumulator. Iterate Over Each Element: For every object in the initial array, we will check if the date is already a key in our accumulator object. Group by Dates: If it exists, add the object to the corresponding array. If it doesn’t, create a new array with that object. Return the Accumulator: After processing all objects in the array, we return the final accumulated object. Implementation Example Here’s how you can implement this solution in code: [[See Video to Reveal this Text or Code Snippet]] Understanding the Code Using the nullish coalescing operator (??=): This operator allows for more concise code by checking if acc[elem.date] is undefined. If it is, it initializes it to an empty array, then pushes the current element into that array. Alternative Method: If you encounter issues with the nullish coalescing operator, you can use a more traditional approach with logical operators. Output After running the above implementation, you will see the following output in the console: [[See Video to Reveal this Text or Code Snippet]] Conclusion By following this approach, we can efficiently group objects by their date properties in JavaScript using the .reduce() method. This technique is not only powerful but can also be adapted for various other scenarios where data needs to be aggregated or organized based on specified conditions. Happy coding, and may your arrays be ever more organized!