Скачать или смотреть How to Efficiently Return an Array of Objects from a Multidimensional Object in JavaScript

Learn how to convert a multidimensional object into an array of objects in JavaScript, bypassing empty values effectively.
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Transforming Multidimensional Objects into Arrays of Objects in JavaScript

Do you have a multidimensional object in JavaScript and need to convert it into a more manageable array of objects? This is a common scenario for developers, especially when handling data structures such as configurations or settings. In this guide, we will walk through the process of iterating over a complex object, effectively ignoring empty values, and returning a simplified array of objects.

The Problem Statement

Consider the following JavaScript object that contains salary information:

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

The goal is to convert this object into an array of objects, where each object includes a name derived from the original keys and the value of the corresponding numeric property. For example, you need to achieve an output that looks like this:

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

The Challenge

In your initial attempt, you faced an issue where the result included undefined values alongside your desired output. Here’s the code you tried:

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This approach resulted in an array with unnecessary undefined entries, leading to the outcome you didn't want.

The Solution

To achieve the desired outcome, we need to refine the previous approach. We will break this down into a more effective method:

Step 1: Iterate through the Object Keys

Using Object.keys(), we will iterate over the top-level keys of the salary object.

Step 2: Create a Nested Iteration

For each top-level key, we will again utilize Object.keys() to loop through the nested keys (min and max).

Step 3: Filter Out Empty Values

We will use a filter to skip empty values and objects that do not belong to our desired output.

Step 4: Flatten the Structure

Finally, we need to flatten the resulting structure to avoid nested arrays.

Here is the optimized code:

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

Breakdown of the Code

Mapping through the main keys: Object.keys(salary).map(k => {...}) allows us to access each key of salary.

Inner mapping: Inside the first map, we map through the keys of each nested object, creating a new object for each key-value pair.

Name Property: The name property concatenates the outer and inner keys to form strings like netto_min.

Value Parsing: The value property uses parseInt to convert the string to an integer — handling strings like 700..

Flattening: The .flat() method combines the arrays into a single array.

Filtering: The .filter(b => !isNaN(b.value)) effectively ignores any entries where the value is NaN (not a number).

Conclusion

The revised code successfully generates an array that contains only the desired values, as seen in the result:

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

Now you have a robust approach for transforming multidimensional objects into a useful array format in JavaScript while avoiding pitfalls like empty values. Happy coding!