Скачать или смотреть How to Omit Object Properties with Lodash in JavaScript

Learn how to effectively use Lodash's `omitBy` method to remove keys from objects based on substring criteria.
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This video is based on the question https://stackoverflow.com/q/69168226/ asked by the user 'redshift' ( https://stackoverflow.com/u/2420614/ ) and on the answer https://stackoverflow.com/a/69168293/ provided by the user 'Ori Drori' ( https://stackoverflow.com/u/5157454/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Removing Object Properties in Lodash Based on Substring

Working with objects in JavaScript can be tricky, especially when you need to perform operations like removing specific properties based on their names. If you're using Lodash, a powerful JavaScript utility library, you might be wondering how to omit properties that contain a certain string. In this guide, we'll walk through a real-world scenario where we need to remove properties ending with _old from a JSON object using Lodash.

The Problem Statement

Imagine you have a JSON object that looks like this:

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You want to remove any keys that have _old appended to them. While omit method works great for removing specific listed keys, it doesn't support patterns. Instead, we need to utilize a function to determine which keys to remove.

The Solution

Lodash provides a method called omitBy() that suits our needs perfectly. This method allows us to pass a predicate function that checks each key for a condition. Let's break down the steps to achieve our goal:

Step 1: Import Lodash

First, make sure you import the omitBy method from Lodash in your JavaScript file.

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Step 2: Define Your Object

Define the object from which you want to omit properties. For example:

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Step 3: Utilize omitBy

Now, let's use omitBy to remove keys that end with _old. Here’s how to do it:

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Explanation of the Code

Predicate Function: The second argument to omitBy is a function (value, key) where value is the value of the property and key is the property's name.

Checking for _old: The condition key.endsWith('_old') checks whether each key in the object ends with the substring _old.

Result: The result will automatically exclude any keys that meet the condition, so you end up with the filtered object without properties that have _old in their names.

Final Output

When you run the code, your output will look like this:

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

Conclusion

Using Lodash's omitBy method allows you to flexibly filter object properties based on string criteria. This can be incredibly useful for cleaning up your objects and working with only the relevant data. Now you have the tools to easily manage your objects by removing properties that aren't needed! If you have any further questions or scenarios, feel free to share them in the comments below.