Скачать или смотреть How to Apply Same ID as Parent to Children in JavaScript Arrays

Learn how to effectively connect parent and child elements in JavaScript arrays by applying the parent's ID to the children. Follow this step-by-step guide for clarity!
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This video is based on the question https://stackoverflow.com/q/64030096/ asked by the user 'Jose Peres' ( https://stackoverflow.com/u/9699805/ ) and on the answer https://stackoverflow.com/a/64030176/ provided by the user 'jonatjano' ( https://stackoverflow.com/u/10153945/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Connecting Parent and Child IDs in JavaScript Arrays

In the world of programming, particularly in JavaScript, we often encounter data structures where we need to logically connect related elements. One common scenario involves arrays of objects that contain a mixture of parent and children elements. This leads us to a common challenge: how to apply the same ID as a parent to the corresponding children at the same level in the structure?

Let’s explore this problem with an example and see how we can solve it.

Understanding the Problem

Take a look at the following array of objects:

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In this array:

We have objects representing parents and children.

Parents have an id, but children do not have a reference to their corresponding parent’s id, which makes it difficult to understand their hierarchy.

The Desired Output

Our goal is to modify this array to include a new attribute, parentId, for each child, indicating which parent it belongs to. The desired output should look like this:

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Step-by-Step Solution

1. Initialize the Variables

To solve this problem, we will loop through the array while keeping track of the last encountered parent’s ID. This requires declaring a variable to store the last parent ID.

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2. Loop Through the Array

We will use the forEach method to iterate through each element of the array. During each iteration, we will check if the current object is a parent or a child.

3. Determine the Conditions

If the object is a parent (where el.name === "parent"), we will update lastParentId with the current parent’s id.

If the object is a child (anything else), we will assign parentId from lastParentId.

4. Putting It All Together

Here is the complete code that implements the above logic:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can effectively connect parent objects with their children by applying the appropriate parentId. This approach is not only useful for enhancing the readability of your data structure but also essential for ensuring that the hierarchy is clear in your application's logic.

Feel free to adapt this method to fit your specific needs as you work with arrays of objects in JavaScript!