Скачать или смотреть How to Iterate through Nested Objects in JavaScript

Discover how to easily iterate through nested objects in JavaScript, including practical examples and step-by-step solutions.
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This video is based on the question https://stackoverflow.com/q/64990871/ asked by the user 'Mint Con Design' ( https://stackoverflow.com/u/14662589/ ) and on the answer https://stackoverflow.com/a/64991126/ provided by the user 'Sergio Vargas' ( https://stackoverflow.com/u/4250480/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Iterate through Nested Objects in JavaScript

When working with JavaScript, you may find yourself needing to manipulate and display nested objects. This can become tricky, especially if you're dealing with several levels of data. In this post, we are going to explore a common scenario: iterating through nested objects to extract specific values and display them.

The Problem

Imagine you have a structured object that holds lists with titles, and each title has associated items (like airports and business-related terms). You want to display this data in a readable format that users can easily understand, such as:

1 List title

Airports

Aircrafts

2 List title

Pilots

Business

The Object Structure

Here's a representation of our nested object:

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

Now, the challenge arises when you want to access both the title of the list (like # 1 List title) and the items within it (like Airports and Aircrafts).

The Solution

To effectively iterate through this nested object, we can utilize the Object.keys() method combined with the map() function. Here’s how we can implement this:

Step-by-Step Breakdown

Use Object.keys() to Get List Titles
The function Object.keys(obj) returns an array of the keys (list titles) present in the object.

Iterate Over Each Key
We can use map() to go through each key and extract the values.

Access Nested Items
For each title, leverage obj[key] to access the associated items and iterate over them.

Implementing the Solution

Here is how the code looks after applying the above logic:

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

Explanation of the Code

Outer Map: The outer map() function iterates through each title in the object.

Inner Map: The inner map() function runs through the array of items associated with each title, allowing you to create a nested structure of elements.

Each div represents a title and its corresponding items, ensuring that they are displayed clearly and organized.

Conclusion

Iterating through nested objects in JavaScript doesn't have to be complicated. By using Object.keys() alongside map(), we can easily access and manipulate the data in an organized manner. This approach not only keeps your code clean but also enhances readability for better usability.

Now you can confidently tackle nested object structures in your JavaScript projects! Happy coding!