Скачать или смотреть Creating a Time Period List in Flutter/Dart: Excluding the Current Time

Learn how to create a delivery time period list in Flutter/Dart while excluding the current time. This step-by-step guide walks you through filtering delivery time options dynamically.
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How to Create a Time Period List Based on the Current Time in Flutter/Dart

In app development, especially when dealing with delivery services, managing time-based options can be a bit tricky. A common problem developers face is creating a list of available time slots that excludes the one containing the current time. This ensures users are presented with realistic options for their deliveries.

Let's take a closer look at how to achieve this in Flutter/Dart.

Problem Overview

Imagine you have several delivery time slots such as:

11am - 2pm

3pm - 6pm

6pm - 9pm

9pm - 11pm

If the current time is 5pm, you want your app to only display the time slots that are available after 5pm, which in this case would be:

6pm - 9pm

9pm - 11pm

Solution: Filtering the Delivery Time Options

To solve this problem, we will create a function that filters out delivery time options based on the current time. Here’s how to do it in a step-by-step manner:

Step 1: Define Your Delivery Time Slots

First, define a list of your delivery periods and their corresponding starting times.

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Step 2: Get the Current Time

Next, retrieve the current hour using Dart’s DateTime class. This will help us determine which time slots to exclude.

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Step 3: Filter the Available Time Slots

Now, we'll filter the list of delivery periods using the map function. For each time slot, we’ll check if the current time is less than the starting time of the slot. If it is, we want to keep that period in our filtered list.

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Step 4: Handle the Result

At this point, listFilteredPeriod will contain only the available delivery periods after the current time. To make this clearer, you might want to remove any null values that can occur if the current time is greater than the period's starting time.

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Complete Code Example

Here is how the complete code would look in a Flutter/Dart project:

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Conclusion

By following these steps, you can easily filter out delivery time options based on the current time in Flutter/Dart. This approach not only enhances user experience but also ensures that your application provides relevant and actionable options.

So, the next time you're dealing with time-sensitive information in your app, consider this method for a clean and efficient solution!