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Extracting Values from Array of Objects in JavaScript

Learn how to effectively `push values from an array of objects` into separate arrays using JavaScript. Find step-by-step guidance to retrieve specific properties from nested data structures. --- This video is based on the question https://stackoverflow.com/q/69119675/ asked by the user 'Aren Trot' ( https://stackoverflow.com/u/15701327/ ) and on the answer https://stackoverflow.com/a/69119944/ provided by the user 'hgb123' ( https://stackoverflow.com/u/6655160/ ) 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: Push values in an array from an array of objects 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. --- Extracting Values from Array of Objects in JavaScript Working with arrays and objects is a fundamental aspect of JavaScript, especially when it comes to managing complex data structures. Today, we’ll explore how to extract specific values from an array of objects, specifically focusing on gathering values from the nested current_result within each project. The Problem Imagine you have the following array of objects that contains project data: [[See Video to Reveal this Text or Code Snippet]] You want to extract the success, failure, skip, and untested values and push them into individual arrays, such as: success = [0, 50, 37] failure = [0, 20, 25] skip = [0, 36, 40] untested = [100, 0, 0] The Solution Let's break down the solution into manageable steps: Step 1: Map to Get Projects First, we need to access the projects array from each object. By using map, we can extract these arrays into a single array of projects. Step 2: Flatten the Projects Array Next, since the projects are nested within each vertical object, we can flatten the resulting array so that we have one single array containing all project objects. Step 3: Map to Get Current Results After flattening, we can map through the project array to get each project's current_result. This will yield an array of objects containing only the results. Step 4: Reduce to Combine Results Finally, we will reduce the array of current results into one object that categorizes all values by their corresponding keys. Implementation Here’s the complete code: [[See Video to Reveal this Text or Code Snippet]] Breakdown of the Code Mapping Projects: We use map on data to isolate each projects array. Flattening: The flat() method is called to combine all nested arrays into a one-dimensional array. Extracting Results: Another map is needed to hone in on the current_result objects from each project. Reducing: The reduce method builds an accumulator object to hold our results. It checks if the key exists; if not, it initializes an array for that key and pushes the value. Output Once you run the above code, you'll receive an output like this: [[See Video to Reveal this Text or Code Snippet]] Conclusion By following these steps, you can efficiently extract and organize data from complex arrays of objects in JavaScript. This method ensures your code remains clean and maintainable, making it easier to manipulate nested data structures. Now you’re equipped to handle array of objects more comfortably and can further explore the various array methods available in JavaScript. Happy coding!