Скачать или смотреть How to Loop Through an Array of Objects in JavaScript

Discover how to effectively loop through an array of objects in JavaScript to retrieve dynamic keys and values. Perfect for beginners and seasoned developers alike!
---
This video is based on the question https://stackoverflow.com/q/74216307/ asked by the user 'Shibbir' ( https://stackoverflow.com/u/1091439/ ) and on the answer https://stackoverflow.com/a/74216361/ provided by the user 'flyingfox' ( https://stackoverflow.com/u/3176419/ ) 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: JavaScript loop through array of Object

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.
---
How to Loop Through an Array of Objects in JavaScript

JavaScript is a powerful programming language that allows developers to work with complex data structures, one of which is an array of objects. If you're trying to extract keys and values from such an array, you may find yourself at a stumbling block—especially when the keys are dynamic and can vary. This guide will guide you through resolving the issue to effectively loop through an array of objects in JavaScript.

The Problem

You have an array of objects that looks like this:

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

Your objective is to extract both the keys and their corresponding values, regardless of how the keys are named. Initially, you may have attempted the following approach:

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

However, this code will not provide you with the desired outcome. Let's explore how to correctly loop through the array and retrieve the data you need.

The Solution

The correct way to loop through an array of objects involves using a nested loop. You can utilize forEach() to iterate over each object within the array and then apply Object.keys() on each individual object to access its keys. Here's how to do it:

Step 1: Loop Through the Array

Start by looping through each object in the array using forEach().

Step 2: Access Dynamic Keys

For each object, retrieve the keys using Object.keys() and loop through those keys to access their corresponding values.

Example Solution

Here's a complete code snippet that accomplishes this:

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

Explanation of Code

Outer Loop: obj.forEach(d1 => {...}) iterates over each object in the array and assigns it to the variable d1.

Inner Loop: Object.keys(d1).forEach(d2 => {...}) retrieves the keys of the current object and iterates over this list of keys.

Output Statement: console.log(d2 + ' = ' + d1[d2]); prints each key and its associated value.

Expected Output

When you run the above code, you will get the desired output:

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

Conclusion

Looping through an array of objects and extracting keys and values is straightforward once you understand the utility of forEach() combined with Object.keys(). With this knowledge, you can easily manage dynamic structures in JavaScript.

Feel free to test the code and modify the objects; it will adapt to whatever dynamic keys you include in your objects. Happy coding!