Скачать или смотреть How to Combine Objects Using UnderscoreJS with Conditions

Discover how to combine objects efficiently using `UnderscoreJS` while applying custom conditions and omitting properties.
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This video is based on the question https://stackoverflow.com/q/68196237/ asked by the user 'jlc488' ( https://stackoverflow.com/u/580082/ ) and on the answer https://stackoverflow.com/a/68207314/ provided by the user 'captain-yossarian from Ukraine' ( https://stackoverflow.com/u/8495254/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Combining Objects with UnderscoreJS: A Functional Approach

In the realm of JavaScript, merging objects can often present challenges, especially when specific conditions need to be met. Today, we’re answering a common query: How can you combine objects using UnderscoreJS, apply conditions, and omit certain properties? Let's dive in and explore a structured approach to achieve this goal.

Understanding the Objective

Let's consider two objects, objA and objB, that hold different data attributes. Our intent is to merge these objects but omit certain properties from objB that match those in objA. Furthermore, we want to add additional properties conditionally.

Given Objects

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In objB, certain keys match those in objA, such as name, address, zip, and currency. We’ll focus on writing concise, functional code that omits these properties and introduces new fields based on specified conditions.

The Solution

Step 1: Setup Functions

Start by defining helper functions to check property equality and to handle the merging logic.

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Step 2: Define Conditional Logic

Next, we need conditions to assign new values based on existing properties:

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Step 3: Compose Functions Together

For merging functions, we can employ a composition function to chain our conditions:

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Step 4: Execute Conditional Merging

Finally, we utilize composed functions to operate on objB:

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Conclusion

By implementing UnderscoreJS with a functional programming mindset, we can elegantly combine objects while applying the necessary conditions and omitting properties. This approach not only enhances code readability but also maintains its functionality.

Here’s a complete version of the code for quick reference:

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You've now successfully learned how to combine objects with conditions using UnderscoreJS! Dive into the implementation, and don’t hesitate to experiment with your own use cases.