# How to Generate a Random Boolean with Probability in Flutter

Flutter Jul 14, 2023

In Flutter, there are times when you may need to generate a random boolean value, but with a certain probability of it being `true`. By default, the `Random` class provides an equal chance of generating `true` or `false`. However, what if you want to control the occurrence of `true` with a specific probability, such as 90%? In this tutorial, we will explore how to generate a random boolean with a specific probability in Flutter.

## Generate a random Boolean

In order to generate a random boolean in Flutter we can use the `Random` class of the `dart:math` library.

``````import 'dart:math';

void main() {
Random random = Random();
bool randomBoolean = random.nextBool();

print(randomBoolean);
}
``````

In this code snippet, we create a random boolean by creating an instance of the `Random` class. On this instance, we call the `nextBool` function to generate a random boolean.

## Generate a Random Boolean with a Specific Probability

If we want to generate a random boolean with a specific probability let us say 90%, we can use the `nextDouble` function of the `Random` class.

``````import 'dart:math';

void main() {
Random random = Random();
bool randomBoolean = random.nextDouble() <= 0.9;

print(randomBoolean);
}
``````

In this code snippet, we again create an instance of the `Random` class. On this instance, we call the `nextDouble` function. This function generates a random value between `0` and `1`. Every time the generated `double` is smaller or equal to `0.9` we return `true`. Otherwise, we return `false`.

## Conclusion

Generating a random boolean value with a specific probability can be helpful in different situations while developing a Flutter application. You can achieve this by using the `Random` class from the `dart:math` library and creating a function that compares the generated random value with your desired probability. This allows you to generate random booleans based on your specific requirements.