Скачать или смотреть How to Sort List dynamic in Dart

Learn how to effectively sort a `List dynamic ` in Dart by providing a custom sorting function for mixed data types.
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How to Sort List<dynamic> in Dart: A Step-by-Step Guide

Sorting lists is a common requirement in programming, especially when dealing with mixed data types. In Dart, when you have a List<dynamic>, sorting can be tricky since it might contain various types like integers and strings. In this guide, we will explore how to sort such a list effectively.

The Problem

You might be wondering, "Can I sort a List dynamic in Dart?" Here’s an example to illustrate the question:

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In this example, the expectation is either to see:

9, 10, 'Plus One'
or

'Plus One', 9, 10

However, Dart needs a little guidance on how to handle different types when sorting. Without clear instructions, it may throw an error or not sort as expected.

The Solution

To sort a List<dynamic> containing various types, you need to define how you want to sort elements of different types. Here’s how to do it step by step.

1. Set Up Your List

First, declare your dynamic list. For example:

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2. Provide a Custom Sorting Function

Use the List.sort method with a custom comparator callback function. The comparator determines the order of elements based on your rules.

Here’s a simple way to write it:

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3. Understanding the Comparator

Same Types: If both elements are of the same type (either both integers or both strings), we compare them using compareTo() method.

Different Types: If one is an integer and the other is a string:

We have chosen to place integers before strings in this example. Adjust this logic if you want a different order.

4. Print the Sorted List

Finally, print the sorted list to see the results:

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

Complete Code Example

Here’s the complete Dart code that sorts a List<dynamic> containing integers and strings:

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

Handling More Data Types

If your list may include other types beyond integers and strings, you will need to extend the comparator function to accommodate those types accordingly. For example, you could add more conditions based on your specific requirements.

Conclusion

Sorting a List<dynamic> in Dart is indeed possible with a custom sorting function. By defining the sort logic based on your needs, you can effectively manage heterogeneous lists and ensure the order is what you expect. Remember, the key is in the comparator function!

Now, you're all set to sort your dynamic lists in Dart like a pro!