Скачать или смотреть How to Add Key and Value to an Array Using JavaScript

Learn how to combine two JavaScript objects into an array with a new structure, using key value pairs effectively.
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This video is based on the question https://stackoverflow.com/q/70281444/ asked by the user 'Jairo Carvajal L' ( https://stackoverflow.com/u/17109625/ ) and on the answer https://stackoverflow.com/a/70281889/ provided by the user 'trincot' ( https://stackoverflow.com/u/5459839/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Add Key and Value to an Array Using JavaScript

Are you struggling to merge information from two different objects into a single, structured array in JavaScript? This is a common challenge developers face, especially when dealing with APIs or data processing. In this guide, we will break down a specific scenario and provide you with a step-by-step guide to achieve your desired output using JavaScript.

The Problem

Imagine you have two objects, each storing information about climate change. Here’s what they look like:

Object 1

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Object 2

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Your objective is to create a new array that combines the Total values from both objects into a new structure, like this:

Desired Output

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You might have attempted to create the array using one of the existing arrays but faced issues where the last value of the second array was being assigned to all the keys of x. Let’s explore how to solve this problem correctly.

The Solution

Step-by-Step Guide

To create the desired array structure, we can leverage the powerful map function in JavaScript. Here’s how we can do it effectively:

Understanding the Structure: Your chartdatavalue has the structure:

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Your second array, arrayforxls2, looks like this:

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Using map with a Shared Index: The key to merging these arrays is to utilize the index i while mapping through the chartdatavalue. Here’s how you can do it:

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Using Spread Syntax: An alternative method involves using the object spread operator, which is a cleaner approach:

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With Object Destructuring: In cases where you want to ignore specific properties, you can destructure el:

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Summary of Key Points

Using map(): This allows you to iterate over your array and apply transformations.

Using Object.assign() or Spread Syntax: These methods let you merge objects seamlessly.

Maintaining Indices: Make sure to capture the index while mapping so that corresponding elements from both arrays align correctly.

Conclusion

By following this guide, you can effectively merge keys and values from multiple objects into a structured array using JavaScript. Whether you choose to use Object.assign() or the spread syntax, both methods achieve the same result, allowing you to add key-value pairs in a clean and efficient way.

With these skills, you'll find it easier to manipulate and combine data in your JavaScript applications. Happy coding!