Скачать или смотреть How to Convert a List of Objects to Another List of Objects in Dart/Flutter

Learn how to easily map a list of custom objects in Dart/Flutter into another list with different properties. Follow our simple guide!
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How to Convert a List of Objects to Another List of Objects in Dart/Flutter

When working with Dart and Flutter, you may often find yourself needing to manipulate or transform data structures. One common task is to convert a list of objects into another list with a different structure. For instance, you might have a list of objects containing detailed information but want to create a simpler version of that list.

In this guide, we'll explore how to efficiently map one list of objects to another list, ensuring that certain properties are retained. This process is straightforward, leveraging Dart's powerful map function.

Understanding the Problem

Imagine you have a list of objects derived from a class named DA_Field. This class may contain several properties, such as DAFIELDKEY, strGROUP, strText, and Status. You want to copy this list into another list of a different class DA_Field_val which has fewer properties (just DAFIELDKEY and Status).

Here are the classes we'll be working with:

The Existing Class: DA_Field

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The Target Class: DA_Field_val

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The Solution: Mapping a List of Objects

To create a new list from the existing list, you can utilize the map function provided by Dart. This function allows you to transform each element from one list into a corresponding element in the new list.

Step-by-Step Implementation

Create an Existing List: First, define a list of DA_Field objects that you want to convert.

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Map the List: Use the map function to iterate through each object in list_DA_Field and create a new DA_Field_val object for each entry.

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Print the Results: Finally, iterate over the new list to verify that it contains the expected values.

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Full Code Example

Here’s how your complete code might look:

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Conclusion

Transforming a list of objects in Dart/Flutter is simple and efficient using the map function. By following the steps outlined in this guide, you can easily convert lists while preserving the necessary properties.

If you have ever encountered a similar situation while coding, feel free to experiment with the map method to optimize your data handling processes. Happy coding!