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Скачать или смотреть How to Dynamically Reference JavaScript Variables Using Objects

  • vlogize
  • 2025-04-07
  • 3
How to Dynamically Reference JavaScript Variables Using Objects
Is there a way to declare a variable by adding a variable name with a variable value?javascript
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Описание к видео How to Dynamically Reference JavaScript Variables Using Objects

Discover how to create dynamic references to JavaScript variables by using objects, instead of traditional variable declarations. Learn best practices and tips to improve your coding skills.
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This video is based on the question https://stackoverflow.com/q/72921945/ asked by the user 'Wild-tuna' ( https://stackoverflow.com/u/19471110/ ) and on the answer https://stackoverflow.com/a/72921980/ provided by the user 'Patrick' ( https://stackoverflow.com/u/13602015/ ) 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: Is there a way to declare a variable by adding a variable name with a variable value?

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.
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Introducing the Challenge: Dynamic Variables in JavaScript

Have you ever found yourself struggling with the need to create dynamic variables in JavaScript? The situation typically arises when we are working with multiple variables that need to be referenced programmatically (for example, when dealing with user orders in a shopping cart application). A common question among developers is: Is there a way to declare a variable by adding a variable name with a variable value?

The Problem Explained

Consider this scenario: you have several arrays that you want to reference dynamically as your code runs. In your specific case, you're attempting to use an incrementing variable (a) to create different references to arrays like orderObj1, orderObj2, etc.

Here's a simplified version of your existing code:

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

The end goal is to make ordName reference orderObj1 initially, and then orderObj2, orderObj3, and so on as a increases. However, randomly concatenating strings to create JavaScript variable names is not a straightforward or recommended approach.

The Solution: Using Objects for Dynamic References

Instead of trying to dynamically create variable names, a cleaner and more efficient approach is to use objects. This method improves readability and maintains the integrity of your code.

Step-by-Step Implementation

Step 1: Create an Object for Your Arrays

Instead of multiple variables, store your arrays within an object. This allows you to programmatically access them using keys.

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

Step 2: Store Values Dynamically

Modify your loop to use the object you created in Step 1. Assign each order to the corresponding property of the orders object.

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

What's Happened Here?

Dynamic Access: Instead of trying to reference variables by name, you used the object keys ("orderObj" + a) to create references.

Array Initialization: Each time a match is found, you create a new array in the orders object dynamically.

Data Organization: This keeps your data organized and manageable, making the code easier to read and maintain.

Important Note: Avoiding eval

While it might be tempting to use eval() to achieve dynamic variable references, it is generally not recommended due to security risks and performance issues. Always opt for safer alternatives like using objects.

Conclusion

In JavaScript, dynamically referencing variables through direct variable manipulation is cumbersome and not advisable. By using an object to hold your arrays, you can easily achieve the same effect in a cleaner, safer way. Now you can efficiently manage multiple order arrays without the need for complicated or risky code practices.

This approach not only enhances the efficacy of your application but also upholds the best practices in JavaScript programming. Happy coding!

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