If you only need a maximum of 500 products and want 4-digit numbers, your proposal is interesting, especially if the numbers are to be generated from a single device. However, there’s a catch: when a product is removed from the list, it only gets deleted on the device in use, which could lead to duplicates if not managed properly.

While you could use a list of integers (List<int>) in the app's state, manually writing all 500 numbers would be tedious. Instead, you could apply a more practical approach inspired by Colin Anthony proposal, adapted for local handling.

First, define a list of integers as a persistent variable within the app. Then, configure a random number generator within the \"load page\" action to create values between 1000 and 9999 (assuming 4-digit numbers are required).

Next, implement a conditional action to validate the generated number. If the number already exists in the list, repeat the generation process until a unique number is found. Once a unique number is generated, store it in a temporary variable and add it to the persistent list.

The advantage of this approach is that everything happens locally while the user fills in the required data. This optimizes generation time, ensures unique numbers, and avoids conflicts or duplicates.

Remember that a local approach limits you to only being able to fill in the data from the same device.

Another approach you could use if you have more experience on the platform is a custom function. You can write the following code:

dart

int newCustomFunction(List<int> list) {

/// MODIFY CODE ONLY BELOW THIS LINE int randomNumber; Random random = Random();

// Initializes the Random instance do { randomNumber = random.nextInt(9000) + 1000;

// Generates a number between 1000 and 9999 } while (list.contains(randomNumber));

// Checks that it’s not in the list return randomNumber;

/// MODIFY CODE ONLY ABOVE THIS LINE

}

How to generate a random number from 1 to 9999?