How to Filter and Sort an Object Array by Date in JavaScript скачать в хорошем качестве

How to Filter and Sort an Object Array by Date in JavaScript

Learn how to effectively filter and sort an object array by date using JavaScript. This guide breaks down the solution step-by-step for better understanding and implementation. --- This video is based on the question https://stackoverflow.com/q/65812772/ asked by the user 'Qr1ea1' ( https://stackoverflow.com/u/14155267/ ) and on the answer https://stackoverflow.com/a/65813321/ provided by the user 'Ali Esmailpor' ( https://stackoverflow.com/u/6859501/ ) 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: Filtering then sorting object array by 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. --- Filtering and Sorting an Object Array by Date in JavaScript In the world of web development, you often find yourself working with data in the form of JSON objects. A common requirement might be to filter this data based on date ranges and sort it accordingly. In this guide, we'll tackle a specific problem related to filtering and sorting an object array based on start and end dates. The Problem Imagine you have an array of objects where each object represents an event with a start_date and an end_date. Your goal is to filter this array so that you only keep the events that are either ongoing or have ended, based on the current date. Once you have this filtered data, you would also like to sort it by the start_date. Example JSON Here's the sample JSON we'll be working with: [[See Video to Reveal this Text or Code Snippet]] When trying to filter this array, you might have run into issues with the current filtering logic. Let’s break down where it went wrong and how to fix it. The Solution Step 1: Convert Strings to Dates The primary reason your filtering logic did not work is that you're comparing date strings rather than actual date objects. To perform date comparisons correctly, you need to convert those strings into date objects using new Date() and then get their time values via getTime(). Step 2: Implementing the Filter Here's how you can implement the filtering and sorting: [[See Video to Reveal this Text or Code Snippet]] Let's break down this filtering function: new Date(item.start_date): Converts the start_date string into a Date object. getTime(): Gets the number of milliseconds since January 1, 1970, which allows for accurate comparisons. dateNow.getTime(): Represents the current date in milliseconds, for comparison purposes. Step 3: Sorting the Filtered Results Once you've filtered your data, you can sort it by start_date using the sort() method: [[See Video to Reveal this Text or Code Snippet]] Complete Code Example Putting it all together, here's how your final code should look: [[See Video to Reveal this Text or Code Snippet]] Conclusion Filtering and sorting JSON data by dates in JavaScript can seem tricky at first, but by understanding how to properly compare date objects, you'll find it becomes much easier. Always remember to convert date strings into date objects when performing comparisons - this small step can save you a lot of headaches. Happy coding!